William O. Douglas

“ First Amendment values ride on what we do today. If government can investigate ideas, beliefs, and advocacy at the left end of the spectrum, I see no reason why it may not investigate at any other part of the spectrum. Yet as I read the Constitution, one of its essential purposes was to take government off the backs of people and keep it off. There is the line between action on the one hand and ideas, beliefs, and advocacy on the other. The former is a legitimate sphere for legislation. Ideas, beliefs, and advocacy are beyond the reach of committees, agencies, Congress, and the courts. ”

“ Those who can be officially pilloried or punished for having a particular philosphic or political creed are effectively deterred from exercising First Amendment rights.
I see no constitutional method whereby the Government can punish or penalize one for 'being a Communist' or 'supporting Communists' or 'promoting communism.' Communism, as an ideology, embraces a broad array of ideas. To some it has appeal because the state owns the main means of production, with the result that all phases of national life are in the public sector, guaranteeing full employment. ”

“ One can think as he likes, embrace any philosophy he chooses, and select the politics that best fits his ideals or needs. That is all implicit in the First Amendment rights of assembly, petition, and expression. Those rights merely enforce, protect, or sanction the beliefs or ideology to which one is committed. So does the right of association which we have said over and again to be part and parcel of those First Amendment rights. Basic in this scheme of values is the immunity of beliefs, ideas, and ideology from government inquiry, probing, or surveillance. ”