Gregory v. Attorney General Of State Of New Hampshire…
“ New Hampshire in my view should be free to investigate the existence or nonexistence of Communist Party subversion, or any other legitimate subject of concern to the State without first being asked to produce evidence of the very type to be sought in the course of the inquiry. Then, given that the subject of investigation in this case is a permissible one, the appellant seems to me a witness who could properly be called to testify about it ”
