Last known plot to whack a boss I could think of that was confirmed by both law enforcement and the streets was the Philly LCN Newark area based crew leader Pete the Crumb Caprio in 2000 was plotting with the Genovese's to whack Ligambi in the infancy stages of being Philly's boss while he was just solidifying his position immediately after Skinny Joey went away to college and then the Genovese's and Caprio were going to take over the Philly rackets. The plot was also to not only whack Ligambi but also Stevie Mazzone and George Borgesi. After those three were whacked, Caprio would take over Philly rackets as a puppet of the Westside. The plot was stopped when Caprio was arrested by the FBI.