The Teamsters have begun informing retirees and current workers that their pension benefits may soon be cut, the final ironic twist to a lobbying campaign that saw the union spend its own members' dollars to win the right to shrink their retirement pay. The somber notifications began going out from the Teamsters Central States Health and Welfare Pension Fund this spring, a decision that could ultimately affect 410,000 current pension participants and a total of more than 10 million U.S. workers nationwide. Cuts could begin as early as next year.