The entanglement between organized crime and labor unions is a story of power, corruption, and survival — a narrative stretching back over a century. Historically, Mafia syndicates such as New York’s Five Families have not only infiltrated but also significantly influenced numerous labor organizations. Their activities ranged from extortion and embezzlement to orchestrating financial schemes that drained union funds, all under the guise of legitimate union business. While well-documented cases reveal Mafia control over unions in sectors like construction and trucking, the question remains: To what extent have these criminal enterprises controlled plumbers’ unions? Despite scattered allegations and some investigative leads, definitive evidence regarding Mafia domination of the plumbing trade remains more elusive, symbolizing the broader complexity of union corruption and organized crime’s adaptability.