Local 38 of the United Association of Plumbers, Pipefitters and Journeymen isn’t quite as powerful as its leaders, or for that matter, critics, thought it was. The U.S. Department of Labor was reportedly set to cut a deal with the union’s de facto boss, Lawrence J. Mazzola, Sr., effectively dropping a suit it filed against the union back in November 2004. Somewhere along the line, DOL stiffened its spine and imposed tough sanctions against the San Francisco local. The union had been accused of diverting funds from five benefit plans toward the upgrading of a hotel-resort complex in rural Northern California it ran. It also had major expansion plans, the centerpiece of which would be a tribal casino.