Witness Protection Program wasn't established until 1970.

Cicci almost certainly got immunity to testify before that Senate subcommittee. If so, he wouldn't have been prosecuted for any crimes he admitted to under oath. Theoretically, he could have walked out of the hearing room. But, I'm guessing, he had other crimes (i.e., state jurisdiction crimes) pending. If so, he might have served a reduced sentence in a secure, somewhat upscale prison cell "suite" as did Joe Valachi.