From the third movie, a meeting among outstanding families is interrupted by a helicopter having a machinegun. It's a bloodbath. Vito attempts to be this to Sonny, when the younger man eagerly asks to enter the business; he's more effective with Michael. ("This detail of ours" or, just "Our Factor"). https://bookmarksea.com/story18777488/the-5-second-trick-for-the-godfather