Almost since its creation, recurring problems with corruption bedeviled the Teamsters Union. David Witwer provides the first in-depth historical study of the forces that contributed to the Teamsters' troubled past and the mechanisms the union employed--from top-down directives to grassroots measures--to combat corruption. Witwer draws on the perspectives of rank-and-file members, union leaders, and the criminal element to explain the processes that allowed organized crime to seize power inside the union. His account includes the infamous links between the Mafia and union head Jimmy Hoffa, but he also tells the little-known story of the McClellan Committee investigation that first brought those links to light. Witwer also examines how anti-labor forces used the Teamsters' unsavory reputation to influence popular and legislative opinion in a broad attack on workers' rights.