Colson, Citing Fifth, Balks at Questions
Ex-White House aide C W Colson refuses on Sept 19 to answer questions put to him by Sen Watergate com, claiming his const right against self-incrimination; D I Shapiro, Colson's atty and law partner, tells com that Colson will not answer questions now because he is 'target' of Fed grand jury investigation and might be indicted; com Vice Chmn Baker says Colson indicated that he would be 'not only willing but eager' to testify if he ceased being 'target' for indictment; purpose of closed meeting is to determine whether Colson would testify freely; Colson asks com to grant him immunity but com votes unanimously not to do so; charges made against Colson by J W Dean 3d noted; Colson, in int with com staff members last summer, reptdly said he played no role whatsoever in planning Watergate burglary or in covering it up afterward; Colson illus