The Godfather (1972)

Don Vito Corleone, the aging patriarch of a powerful New York mafia family, presides over his daughter's wedding. His youngest son, Michael, a decorated war hero, wishes to distance himself from the family's criminal dealings. However, when a drug dealer named Sollozzo seeks the Don's protection to push narcotics, Vito refuses, igniting a violent conflict. A failed assassination attempt on Vito forces Michael to step in and defend the family.