They started out as a small-time Brooklyn corner crew, but once the killing started it didn't stop. They became the hitmen of choice for their Mafia bosses, who came to know, use and ultimately fear them themselves. They would kill for profit and pleasure, cold-blooded plans and sudden violent whim. Now thanks to the personal revelations of one of the key players, the inside story of these Mafia serial killers can be told in all its astonishing detail.