Segretti Describes Chapin As Boss of ‘Dirty Tricks’
D H Segretti testifies on Oct 3 before Sen Watergate com that he had reptd regularly last yr to Pres Nixon's apptmts sec D L Chapin about 'dirty tricks' he was playing on candidates for Dem Pres nomination; says he had no reason to believe that Nixon knew of his work; Chapin has maintained that Segretti operated on his own, and that after he hired him, he heard little from him; Segretti's testimony is cut short after com recd threat that bomb had been place in Sen Caucus Room; police find no bomb and testimony continues in afternoon; illus