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Avishai Raviv (born 8 June 1967, Hebrew: אבישי רביב) was an agent of Israel's Shin Bet or Shabak, Israel's domestic intelligence service. Some rightists say his mission was to encourage and fabricate activities of right-wing extremists. His code name was 'Champagne'.
At one protest, Raviv was filmed with an image depicting Israeli prime minister Yitzhak Rabin in an SS uniform, prior to Rabin's murder. Raviv allegedly knew of Yigal Amir's plans to assassinate Rabin, based on a controversial classification of handing over "Jewish land" in the category of "din rodef" ("law of the pursuer"). According to Jewish law, anyone who is classified as a pursuer, must be killed immediately. The classification of a forfeiter of land as a rodef states that "If a Jew gives up the land of other Jews to Goyim, and he persists in this, that is, he gives up the land of three or more Jews, he is a rodef." Uri Dan, a journalist close to Ariel Sharon, wrote that witnesses heard Raviv tell Amir: "Be a man! Kill him already!" 
After Rabin was assassinated, the journalist Amnon Abramowitch revealed that Raviv was an agent of the Shabak.
Raviv was brought to trial in 2000 for not preventing Rabin's assassination. Raviv mounted a successful defense on the grounds that he had just been doing his job and events had spun out of control.
- Ex-Undercover Agent Charged as a Link in Rabin Killing, New York Times, April 26, 1999
- Duboff, L.H. "What Really Happened with Yitzhak Rabin and Avishai Raviv?", Jewishmag, January, 2000. Retrieved on March 24, 2013.
- Reinfeld, Moshe Haaretz, Jerusalem, Apr.01, 2003. Retrieved March 24, 2013.
- Uri Dan, "Slander and Libel from the Left", Jerusalem Post, May 22, 1997