You may be talking about Accardo giving his ok for the hit. There are lots of theories about the decision to hit Giancana; some authorities say Accardo was the last to agree.

There are reports that suggest Accardo extended an invitation to Giancana to have a "sit-down." Giancana, suspecting a trap, responded by telling Accardo to "go to hell." I don't know how anyone would know these things, so it may or may not be true.

My sources are the numerous articles on the Internet, books, emails and telephone conversations with Outfit historians and authors in Chicago.