* Milton R. Wessel; Organized Crime Prosecutor

Milton R. Wessel, 67, former head of a Justice Department unit specializing in organized crime prosecutions. From 1958 to 1960 the attorney and professor at Georgetown University Law School headed a group within the Justice Department that specialized in organized crime cases. His most famous case involved the prosecution of more than a score of alleged Mafia figures seized after a meeting in Apalachin, N.Y., in 1957. They were charged with conspiring to obstruct justice by refusing to divulge the nature of their meeting. But the case collapsed when an appeals court ruled that the defendants’ constitutional rights had been violated. In recent years, Wessel had been special assistant to the executive director of Adapso, a computer software and services industry association. He also was general counsel to the Chemical Industry Institute of Toxicology and to the Council for Chemical Research. In Washington on Monday of coronary thrombosis.