SLAPP suits

Supreme Court
United Mine Workers v. Pennington, 381 U.S. 657 (1965)
Eastern Railroad Presidents Conference v. Noerr Motor Freight, 365 U.S. 127 (1961)
Professional Real Estate Investors v. Columbia Pictures, 508 U.S. 49 (1993)
Columbia v. Omni Outdoor Advertising, 499 U.S. 365 (1991)

Other
Protect Our Mountain Environment, Inc. v. District Court, 677 P.2d 1361 (Colo. 1984)
Oregon Natural Resources Council v. Mohla, 944 F.2d 531, 533 (9th Cir. 1991)
Gordon v. Marrone, 590 N.Y.S.2d 649, 656 (1992)

Anti-SLAPP statutes: state summary

Pring, George, and Canan, Penelope, SLAPPs: Getting Sued for Speaking Out (Temple University Press, 1996) — see esp. pp.18, 148

California Anti-SLAPP Project Web site includes list of states with laws protecting SLAPP victims
SLAPP Resource Center, clearinghouse of resources and referrals on SLAPPs
First Amendment Project's "Guarding Against the Chill: A Survival Guide for SLAPP Victims," guidebook for SLAPP defendants, co-written with California Anti-SLAPP Project
Federal Rules of Civil Procedure, Rule 11
Environmental Defender Law Center: Nonprofit organization that enlists American law firms to work pro bono in defending against SLAPP suits in the U.S. involving environmental issues