Last month Duggan was at it again. On his 10:30 p.m. show, he took a few sideswipes at the forthcoming championship Marciano-Walcott fight, which is promoted by Jim Norris and his I.B.C., and due to be televised by NBC. The next day, says Duggan, he was fired again. Thousands of Duggan fans again phoned, wired and wrote their protests, but this time NBC stiffly announced that it had "terminated the services of Mr. Thomas Duggan because of his failure to adhere to . . . standard operating policies. This policy requires all material for broadcast to be cleared in advance."