Former Teamsters boss Roy L. Williams, jailed on conspiracy and mail fraud charges, asked in U.S. District Court in Chicago that his conviction be set aside because of a recent Supreme Court ruling limiting the scope of mail fraud convictions. Williams, 72, was convicted with alleged organized crime associates in December, 1982, of participating in a scheme to bribe a U.S. senator in return for his vote against deregulating the trucking industry. He also was convicted of conspiring to defraud the Teamsters Central States Pension Fund. In July, the Supreme Court ruled that a defendant cannot be convicted of mail fraud for denying people their intangible rights. The indictment against Williams accused him of depriving Teamsters of their right to honest and loyal services from their officials and trustees.