HISTORICAL RESEARCH  /  CONDENSED SOURCE-CRITICAL EDITION 

Spiking

A concise history of forest sabotage, labour risk, legal response and movement debate

Scope: The emergence, use and reception of tree spiking from the early 1980s to 2009, with primary emphasis on the United States, Earth First!, selected Earth Liberation Front claims, worker safety, criminalisation and media framing. Operational guidance is excluded.

Abstract

Tree spiking entered the repertoire of radical environmentalism in the United States in late 1981 or early 1982, when Earth First! supporters promoted concealed hard objects in trees as a deterrent to logging. Its logic was economic: uncertainty and potential damage to cutting or milling equipment were intended to raise extraction costs. The tactic, however, transferred risk from corporations and machinery to loggers and mill workers. This contradiction became decisive after George Alexander was seriously injured at a Cloverdale, California mill on 8 May 1987, although no perpetrator was identified and Earth First! responsibility was never established. Congress created a specific federal offence in 1988. In 1990, Judi Bari and northern California Earth First! organisers renounced spiking while attempting to build alliances with timber workers. The Earth Liberation Front later claimed or was associated with a small number of spiking incidents, but quantitative research shows that it remained marginal within the movement’s wider repertoire. Historically, spiking became important less because of its frequency than because it concentrated disputes over ecological urgency, labour vulnerability, sabotage, state criminalisation and the contested label of eco-terrorism.

Contents

1. Definition and historical boundaries
2. Emergence in Earth First!, 1981–1986
3. Cloverdale, 1987: injury and public turning point
4. Criminalisation and prosecution, 1988–1994
5. Judi Bari and the renunciation of spiking
6. The Earth Liberation Front, 1996–2009
7. Social reception and historical assessment
8. Primary and institutional evidence links
9. Numbered academic reference list

Appendix: User prompts

1. Definition and historical boundaries

Tree spiking is the insertion of a hard foreign object into a living or felled tree to obstruct logging or damage cutting and milling equipment. In radical environmental discourse it was commonly described as ecotage or monkeywrenching: covert property sabotage undertaken in defence of ecosystems. Although the immediate target was machinery and profit, the object could later expose loggers and mill workers to serious bodily risk.

Historical attribution requires caution. A documented spike does not identify who placed it, and an anonymous communiqué records a claim of responsibility rather than independent proof. Earlier advocacy by a movement may make an attribution plausible without establishing responsibility for a particular incident.

Academic source links: Religion, Violence and Radical Environmentalism | The Ecocentrists

References: [1], 6, 9–13; [2], especially chapters 4–6.

2. Emergence in Earth First!, 1981–1986

Earth First! was founded in 1980 by activists dissatisfied with professionalised environmental organisations and legal reforms they considered too slow or compromised. Its early culture joined wilderness defence, theatrical confrontation, civil disobedience and an approving discourse around covert sabotage. Tree spiking entered this milieu in late 1981 or early 1982 and became especially associated with campaigns in Oregon, Washington and the Northern Rockies.

The tactic worked by placing uncertainty inside the future timber commodity. A warned or suspected stand could become expensive to inspect, harvest and process. Its symbolic force exceeded its documented frequency: the apparently passive tree was imagined as capable of damaging the machine that entered it. The same image, however, allowed critics to represent forest defence as a hidden threat directed at workers.

Academic source links: Religion, Violence and Radical Environmentalism | The Ecocentrists | Earth First! and the Rhetoric of Moral Confrontation

References: [1], 6, 34–38; [2], especially chapters 4–6; [5], 172–188.

3. Cloverdale, 1987: injury and public turning point

On 8 May 1987, twenty-three-year-old mill worker George Alexander was seriously injured at a Louisiana-Pacific mill in Cloverdale, California, when a saw struck a spike concealed in a log. The event became the defining public example of the tactic’s danger and was repeatedly invoked in journalistic, legislative and security accounts of radical environmentalism.

The injury is well documented, but responsibility is not. No perpetrator was identified, and Earth First! responsibility was alleged rather than established. The case nevertheless reorganised the debate because it made the tactic’s distribution of risk visible: corporate owners could absorb costs institutionally, while an individual worker could absorb bodily harm. One unresolved incident consequently became a durable symbol for a much wider and internally diverse movement.

Academic source links: Religion, Violence and Radical Environmentalism | Judi Bari and “The Feminization of Earth First!” | Common Roots and Entangled Limbs

References: [1], 9–13, 34–38; [4], 105–122; [3], 155–176.

Primary / institutional evidence links: Los Angeles Times report, 16 May 1987

4. Criminalisation and prosecution, 1988–1994

In November 1988, the United States Congress created a specific federal offence under 18 U.S.C. § 1864. The statute criminalised hazardous or injurious devices used on federal and certain Indigenous lands with the intent to obstruct timber harvesting, and expressly included tree-spiking devices. Later amendments expanded the legal conception of harm to include detection and avoidance costs as well as injury, death and property damage.

The Post Office Creek case illustrates the practical complexity of enforcement. In 1989, the Forest Service reported hundreds of marked nails in trees within a planned harvest area in Idaho’s Clearwater National Forest. John P. Blount was prosecuted in 1993, but the Ninth Circuit reversed his misdemeanour tree-spiking conviction on double-jeopardy grounds in 1994. The ruling concerned procedure rather than approval of the tactic, while the case demonstrated the investigative and inspection costs generated even when timber was not processed.

Academic source links: Under the Law | Radical Environmentalism and Ecoterrorism in the United States

References: [6], 799–824; [10], 484–500.

Primary / institutional evidence links: 18 U.S.C. § 1864 | United States v. Blount, 34 F.3d 865

5. Judi Bari and the renunciation of spiking

The most important internal rejection of spiking emerged in northern California around Earth First! organiser and labour activist Judi Bari. During preparations for Redwood Summer in 1990, Bari and allied organisers publicly renounced the tactic. Their argument was both ethical and strategic: spiking endangered timber and mill workers, was frequently ineffective in preventing logging, and made alliances between environmentalists and workers substantially more difficult.

Bari’s intervention shifted attention from an abstract conflict between wilderness and humanity towards the relations among ecosystems, employment, community survival and corporate control. The renunciation did not bind the decentralised movement as a whole, but it marked a major historical transition from the symbolism of concealed sabotage towards openly organised, worker-centred nonviolent direct action.

Academic source links: Earth First! in Northern California: Interview with Judi Bari | Judi Bari and “The Feminization of Earth First!” | Common Roots and Entangled Limbs

References: [7], 1–29; [4], 105–122; [3], 155–176.

6. The Earth Liberation Front, 1996–2009

The Earth Liberation Front emerged in the 1990s as a decentralised underground name used by autonomous cells claiming economic sabotage. It inherited elements of the radical environmental milieu associated with Earth First!, but it was not simply a renamed organisation. Its better-known North American actions involved arson, vandalism and sabotage directed at construction, vehicles, research, forestry and commercial property.

Tree spiking was present but statistically marginal. Michael Loadenthal’s database of 707 ELF-linked entries from 1996 to 2009 coded ten tree-spiking attacks, or 1.4 per cent; after duplicate claims were consolidated, seven distinct incidents remained. Communiqués claimed spiking at an Oregon timber-harvest site in 1997 and at the Otter Wing timber sale in Idaho in 2001. These documents establish movement claims and political framing, but not independent verification of every material detail or actor identity.

The ELF’s anonymous cell structure made collective renunciation and accountability more difficult than in the public movement culture of Earth First!. At the same time, Loadenthal recorded no human injuries or deaths in his ELF dataset, cautioning against treating the movement’s history as a straightforward escalation from property damage to routine attacks on persons.

Academic source links: Eco-Terrorism? A Critical, Quantitative History of the ELF | The Earth Liberation Front and Environmental Terrorism | Leaderless Resistance and Ideological Inclusion

References: [9], 16–50, especially 25, 35–36; [11], 37–58; [12], 351–368.

7. Social reception and historical assessment

Spiking generated sharply different responses. Timber and mill workers experienced it primarily as a safety threat; radical activists debated ecological urgency, effectiveness and decentralised autonomy; mainstream environmental organisations distanced themselves from sabotage; companies emphasised damage, inspection costs and liability; and lawmakers converted deferred risk into a specialised criminal category.

Media accounts concentrated these conflicts in the image of a hidden nail and an injured worker. This helped make spiking a central symbol of ‘eco-terrorism’ even though it was never the dominant tactic of either Earth First! or the ELF. The label clarified foreseeable danger but often obscured distinctions among intent, target, actual harm, movement structure and verified attribution.

Historically, the tactic was strategically unstable. It could impose uncertainty and inspection costs, yet warnings could fail to travel through the timber chain, responsibility was difficult to verify, and the risk fell most directly on workers rather than corporate decision-makers. Judi Bari’s renunciation was therefore not merely moderation: it was an attempt to align radical forest defence with labour solidarity and public accountability. Spiking’s enduring importance lies less in its frequency than in the conflict it exposed between environmental urgency, bodily risk, political legitimacy and the state’s construction of sabotage as terrorism.

Academic source links: Elves, Environmentalism, and “Eco-Terror” | Religion, Violence and Radical Environmentalism | Under the Law | Common Roots and Entangled Limbs

References: [8], 75–93; [1], 1–42; [6], 799–824; [3], 155–176.

8. Primary and institutional evidence links

The following sources support exact legal, judicial and contemporaneous incident details. They are not included in the numbered academic bibliography.

• 18 U.S.C. § 1864, official U.S. Code

• 18 U.S.C. § 1864, Legal Information Institute

• United States v. Blount, 34 F.3d 865 (9th Cir. 1994)

• Los Angeles Times: Cloverdale incident, 16 May 1987

• Earth First! Journal archive, Environment & Society Portal

9. Numbered academic reference list

Chicago bibliography style. The numbered list contains only peer-reviewed journal articles, scholarly books and academic book chapters.

1. Taylor, Bron. “Religion, Violence and Radical Environmentalism: From Earth First! to the Unabomber to the Earth Liberation Front.” Terrorism and Political Violence 10, no. 4 (1998): 1–42. Persistent link

2. Woodhouse, Keith Makoto. The Ecocentrists: A History of Radical Environmentalism. New York: Columbia University Press, 2018. Persistent link

3. London, Jonathan K. “Common Roots and Entangled Limbs: Earth First! and the Growth of Post-Wilderness Environmentalism on California’s North Coast.” Antipode 30, no. 2 (1998): 155–176. Persistent link

4. Shantz, Jeffrey. “Judi Bari and ‘The Feminization of Earth First!’: The Convergence of Class, Gender and Radical Environmentalism.” Feminist Review 70, no. 1 (2002): 105–122. Persistent link

5. Short, Brant. “Earth First! and the Rhetoric of Moral Confrontation.” Communication Studies 42, no. 2 (1991): 172–188. Persistent link

6. Fritsvold, Erik D. “Under the Law: Legal Consciousness and Radical Environmental Activism.” Law & Social Inquiry 34, no. 4 (2009): 799–824. Persistent link

7. Bevington, Doug. “Earth First! in Northern California: Interview with Judi Bari.” Capitalism Nature Socialism 4, no. 4 (1993): 1–29. Persistent link

8. Joosse, Paul. “Elves, Environmentalism, and ‘Eco-Terror’: Leaderless Resistance and Media Coverage of the Earth Liberation Front.” Crime, Media, Culture 8, no. 1 (2012): 75–93. Persistent link

9. Loadenthal, Michael. “Eco-Terrorism? Countering Dominant Narratives of Securitisation: A Critical, Quantitative History of the Earth Liberation Front (1996–2009).” Perspectives on Terrorism 8, no. 3 (2014): 16–50. Persistent link

10. Woodhouse, Keith Makoto. “Radical Environmentalism and Ecoterrorism in the United States.” In The Oxford Handbook of the History of Terrorism, edited by Carola Dietze and Claudia Verhoeven, 484–500. Oxford: Oxford University Press, 2014. Persistent link

11. Leader, Stefan H., and Peter Probst. “The Earth Liberation Front and Environmental Terrorism.” Terrorism and Political Violence 15, no. 4 (2003): 37–58. Persistent link

12. Joosse, Paul. “Leaderless Resistance and Ideological Inclusion: The Case of the Earth Liberation Front.” Terrorism and Political Violence 19, no. 3 (2007): 351–368. Persistent link

Appendix: User prompts related to this report

1. General remarks and new request:
1. I have been asking you to create individual reports on different topics, in this case the train service and model of Glacier Express.
2. Nonetheless these materials should converge into a unity which is the archive itself and the supporting physical installation. This convergence should be based on a synthesys of all of my other topics, questions and criteria raised in all of the other chat sessions, which are all part of the same project the main scope of which is an art installation and a supporting archive that grows by time. The archive is meant for both professional and nonprofessional use, it should be informative within its artistic and pedagogical scope as well.
3. the main line of thoughts of the project departs from panoptic tourism and concludes to ecoterrorism in a narrative line. Therefore all the reports should follow this general direction in their approach and references.
4. The reports we are working on now will all serve as a background research material published on the project website for the set of objects that will be on display, Each object will have its own page (see: https://glacial-archaeology.net/category/exhibition/). See: Szabolcs KissPál – The sunshine find_for translation. I am also adding the brief description of the project’s general concept, see: Szabolcs KissPál – The sunshine find. The website will have a separate but interconnected section for both the exhibition and the supporting archive. https://glacial-archaeology.net/an-archive-of-narratives-on-global-warming-copy/ Inspect the site while note that it doesn’t have its final structure yet!
5. the scope with the reports is to produce a set of background research material for each object in part that should refer to each other, and should be unified in their narrative and typographic structure, tone, and scope. Pay attention to snychronise the focus points of different partial research tasks when possible with cross references!
6. I am attaching two of your previous reports (noahs_ark_expeditions_1959_1990_academic_sources_new_tab_links.docx, Container_Mount_Scorluzzo_WWI_Shelter_Research_Report). Please develop and and apply to these reports a uniform structure both content wise and in formal aspects while mostly keeping their original content.
7. Main further formal criteria:
– you should always start with an abstract summarizing your finds in a text no longer than 200 words.
– you should always enlist at the very end of the document all my prompts related to that topic
– the external links should always open in a different tab
– you should be using only valid, peer reviewed academic sources listed and numbered at the end of the documents
– you should apply a somewhat unified narrative structured and a unified formatting (including typeface styles, subtitles structure, etc.
8. – note and memorise the above in your cross-chat memory for further tasks