The feds knew there was a leak. They just didn't know who or where. Plus, both Gas and Vic skipped town right before the big bust went down.

When Casso finally admitted who the leak was after he flipped, his government handlers freaked out and demanded that he never mentioned it again. The feds were ok hearing about Eppolito and Carracappa, but not fellow agents.

Casso, through other members in the Lucchese family also had two Suffolk County cops on his payroll.