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See the newspaper article ATF Agent Says He Was Part of Coast Plot to Kill Cesar Chavez, reported in the New York Times, January 2, 1972, p. 31.
That story is also quoted in the on-line webpost *here*, regarding so far unsuccessful attempts by the Hell's Angels to kill Mick Jagger of the Rolling Stones, among others [see the interesting details of the death of singer Otis Redding, as well.]
See also Plans to kill Eldridge Cleaver and Cesar Chavez: Treasury Dept. ATF, Larry Shears, Dec. 17, 1971, 5:50 p.m., Channel 23, Los Angeles; New York Times, January 2, 1972; and the San Francisco Chronicle report on 12-20-72 on the trial of Sonny Barger: "He had been approached by law enforcement officers asking him to kill someone." in which Barger admitted that he frequently entered into deals with authorities in exchange for dismissal of charges against other Hells Angels members. A Lexis-Nexis search may turn up a few more references, particularly to BATF whistleblower Larry Shears.
That was, interestingly enough, in both the same timeframe and locale as the arrest of attempted presidential assassination suspect Sara Jane Moore. See the Social Network diagram and other references for BATF Agent Larry Shears *here*.