Butch was Giancana's driver and bodyguard while he was boss. After Sam was killed, Butch did the same for Aiuppa and Accardo. Most signs point to Butch being the killer of Giancana as he was someone who was able to gain access to Giancana's house and had his trust. No way would Giancana have let a Tony Spilotro or a Turk Torello or a John DiFronzo in his home. Chuckie English and Chuck Nicoletti were too close to Sam and too estranged from Aiuppa and Cerone to even be approached for the hit. This may have cost them their lives and saved Butch's as he was one of the few old-school Taylor Street guys to last into the eighties without being killed or shelved.

Blasi was also a sort of courier for Giancana, carrying messages to and from the various crews and associates of the Outfit. For a time, he also relayed messages between Giancana in Mexico and Chicago. In addition, he was known as a top enforcer and probably coordinated and carried out some high profile hits but was never convicted or charged with any murder. He also dabbled in construction and was a licensed real-estate broker, and an attempt to have his license revoked met with failure when it was revealed that he had never been convicted of a crime in an Illinois court (although he had federal convictions for counterfeiting and weapons possession on his record), but this was later overturned on a technicality and Blasi's license was revoked.

Blasi was later imprisoned for refusing to testify against Accardo in hearings concerning the 1978 retaliatory slayings of four burglars suspected of robbing Accardo's home. He was also viewed as a person of interest in the slaying of Chuckie English but was never charged. Interestingly enough, he was also viewed to be endangered himself due to his longtime association with English.

He more or less retired in the mid-eighties as his health rapidly deteriorated and later died in 1993.