A: Saratoga

No, although Giancana controlled and directed Rubys actions, he was not a shooter!
According to brother Chuck Giancana, a shooter by the name of Chuck "needles" Nicoletti was the assasin. Giancana was directly involved in the assasination and after becoming the Outfits boss, began working with Cuban exiles and the CIA in an attempt to kill JFK.

Q: what famous Chicago rat was found chopped up inside a 55 gallon drum in Florida after apparently telling a grand jury about the White/Black hand (CIA/mafia) ops in the early sixties?