Dwalin, the feds gave Valachi a lot of information that they could not use as they obtained them through the use of illegal wire taps and bugs. Valachi was a perfect mouth piece for the information.
Speaking of illegal wiretaps, I remember they recorded enough in Patriarca's office to make him fry on the electric chair 100 times, yet it wasn't allowed because they didn't have a warrant for the bugs or something. But at the time Robert Kennedy was the general attorney, didn't he directly authorize Patriarca's wiretapping? Here
http://www.trutv.com/library/crime/gangsters_outlaws/family_epics/providence_mob/3.htmlit's said he hated Patriarca and said "we're going after that pig on the hill", so if for the general attorney it was ok, why were the tapes defined illegal? What else did they want, an authorization by Patriarca himself?