The Bull is back on the streets. Sammy “The Bull” Gravano, once John Gotti’s loyal underboss until he flipped and joined the feds, walked out of an Arizona prison this month after doing nearly two decades on a drug conviction, authorities said. The now 72-year-old Mob killer, who confessed to 19 murders, was convicted in 2001 for dealing ecstasy after leaving the arms of the federal Witness Protection Program. The Brooklyn-born Gravano still faces parole for the rest of his life – likely spent in an undisclosed location. It’s a drastic change from his first go-round as a defendant. Back then, after ...