Many people were scared of him and his crew. They made more than 200 murders
From wikipedia:
Ironically, according to Casso, Castellano ordering DeMeo's execution sealed his own fate, as Gotti and DeCicco were planning to kill him, and would do so on December 16, 1985. Casso said they would never have dared to move against Castellano while DeMeo was still alive.
