This article is the only historical compilation we've seen on a topic that the major media treats superficially, if at all. The history of the New Left's transition from a nonviolent movement during 1965-1969 to the riots and scattered bombings of the 1970s is distinguished by a succession of government infiltrators who provoked the movement toward greater violence. This article reviews case histories and delineates common patterns. It was written before the Freedom of Information Act was available, so most of the information was placed in the public domain by federal and local prosecutors, who occasionally had to expose their agents in order to prosecute movement activists. One wonders how many stories still haven't been told.