Joshua Gotbaum doesn’t like telling retirees that their pensions are about to be cut. After all, until August he was the director of the Pension Benefit Guaranty Corporation (PBGC), the federal insurance fund that’s supposed to safeguard pensions. But yesterday Gotbaum interrupted a vacation in Madrid to return my call asking about a bill working its way through Congress that would allow multi-employer pension plans to cut benefits. He’s a huge supporter of the legislation.