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Busy but discreetly mum were black-browed John Edgar Hoover and his FBIndians. Months ago they warned U. S. industrialists that sabotage might lie ahead, handed out a printed pamphlet on how to head it off by greater vigilance, better plant supervision. Until they could nab an active saboteur, they had to keep their evidence to themselves. Up to last week, they had apparently nabbed none. Not thus inhibited was Martin Dies. Last week he announced that he and his committee had compiled a fat tome on sabotage agents, intimated that shortly he would release it to press and public. It may need fast editing to be up to date. Tin's week, the main building of the American Cyanamid plant at Bridgeville, Pa. was wrecked by an explosion; the tiny plant of Pennsylvania Chemical Corp. at Johns town was destroyed by fire.