Here is an excerpt from an interview which should answer your question, judeanoncapta, concerning Rabbi Kahane and the FBI:
Q: Did you work for the FBI then?
A: Yes, I worked for the FBI.
Q: What can you tell us about that period?
A: Together with a friend of mine, I worked in a small research group in Washington. At that time, the FBI wanted to get more information about the actions of the right wing, not just the left wing, movements. The FBI came to see us, knowing that we were Jewish, and offered us a contract. Our work consisted of infiltrating the John Birch Society, and I was very keen on doing it, because it was an extreme-Right, anti-Semitic and very dangerous movement. I infiltrated them over a period of three years. I had a new name, a new address, etc....
Q: So you were an underground FBI agent in the Birch Society?
A: I became a member of the organization and was able to discover the source of their funding. It was a great service rendered to the Jewish cause. Since 1965-66, the John Birch Society has been reduced to nothing
Source -
http://www.kahane.org/meir/interview.htmI'll leave the rest up to Chaim. I'll only say this: Robert Friedman, YM"S, was a vicious leftist who through his books attempted to undermine Israel's effort to survive by attacking righteous Jews. He was complete scum.
Alright, I feel obligated to ask a question.
Chaim, were you involved in the Jews Against Jackson movement? Do you feel that the Nazi Jesse Jackson is relevant today? Relevant in the sense that he may still have a strong influence as a black "leader". Or is he irrelevant?