it could be for a variety of reasons, maybe he is going to testify/appear before a grand jury pr before congress... who knows...

i remember in casso's book he talked about how the feds transferred him to a few different jails while they were doing some changes in his original prison which was ADX at that time.

During one of these excursions to another prison, Casso was on the same bus as Amuso and they both started talking. Amuso was like "I can tell from the look on your face you regret turning" and then Casso was telling him how the govt "screwed" his deal up.