Huh? How does mentioning Philbrick make you think I want to become a counterspy? That said, the FBI would probably shoot me in the back of the head. Back in those days, the federal government was more trustworthy. He got involved when his student group was slyly taken over by strangers and re-utilized to oppose American involvement in WW2 (though they switched to being pro-war when the Nazis turned on Russia). He became involved as a counterspy when he went to the FBI to report that his organization had been coopted by possible communists. They encouraged him to stick it out and bring them information, which he did, for many years, going quite high into the communist party. His testimony was later used to convict 11 or so high ranking members of the communist party who served the Kremlin.
Probably not would the FBI shoot you in the back of the head ... but the kgb would. You remind me of past kgb.