Think about it, if he has immunity, then he has to talk, if not, he takes the fifth;
I have a theory on this time period, the MObsters were scared shitless of the cia,
You know that scene in the good Shepard, where the old school mobster talks to Matt Damon and says you guys are the ones that really scare me, you make the real wars?
The blanket denials on narcotics? Fbi, labor leaders like Sidney Hellman, if these people talked, it woulda put the country in a uproar...