42 USC 1986 creates a narrow civil claim against a person who knows a wrong described in Section 1985 is about to occur, has power to prevent or help prevent it, and neglects or refuses to do so. The wrongful act must occur, and the claimed damages must be ones reasonable diligence could have prevented. This is not a general lawsuit for failing to stop any misconduct. [1]
The underlying conspiracy comes first
The text expressly links liability to wrongs conspired to be done under Section 1985. A plaintiff therefore must identify a legally qualifying underlying conspiracy rather than simply allege that several people acted unfairly. The requirements differ among Section 1985’s provisions and the type of conduct alleged.
For example, knowing that two people disagree with someone is not the same as knowledge that a specified unlawful conspiracy is about to be carried out. A complaint needs facts connecting the defendant’s knowledge, practical ability to intervene, failure to act, and resulting harm. [1]
Power to prevent and causation
A person’s job title alone does not establish the ability to prevent a wrong. Relevant evidence might include actual authority, access to decisionmakers, warnings received, opportunities to act, and steps that could reasonably have prevented injury. Likewise, knowledge acquired only after the wrongful act ordinarily presents a different issue from advance knowledge.
The statute limits recovery to damage the person could have prevented through reasonable diligence. This makes the timing of warnings and the causal explanation important, rather than treating every bystander as equally responsible. [1]
The one-year filing period
Section 1986 expressly bars an action not commenced within one year after accrual. Do not assume that a longer state personal-injury period or a different civil rights claim’s deadline controls. Accrual and any asserted tolling require careful legal analysis, and an administrative report should not be assumed to stop the clock. [1]
Remedies and case planning
Section 1988 authorizes discretionary reasonable attorney fees in qualifying actions enforcing Section 1986, but fees are not automatic and do not cure a deficient underlying claim. [2] Preserve communications, dates, warnings, and evidence of the specific preventable injury.
Compare Section 1983 defendants and immunity and federal prosecution duties under Section 1987. Those provisions serve different functions. Combining their numbers in one complaint does not replace pleading and proving each statute’s requirements.
Primary sources
- 42 USC 1986 – Action for Neglect to Prevent
- 42 USC 1988 – Proceedings in Vindication of Civil Rights
Sources checked: October 31, 2026.