Rather than censoring Holocaust deniers, some individuals have decided to refute their absurd claims with facts, illustrating how the Internet can police itself without restricting speech. Kenneth McVay started doing that in 1991, and his efforts developed into the Nizkor Project.
Drobnicki, John A. 1996, Oct./Nov. The Nizkor Project and the fight against Holocaust-denial. The 'Net Homesteader 1(4).