General   (General discussion, talk about anything.)

When I was young, a commonly heard term was "Crypto-communist": someone who did not own the label, ie did not admit to so being, but nevertheless always chose to advance their argument/agenda.

(I guess one step up from 'a fellow traveller'.)

Today, it seems we have the equivalent: a Crypto Alt-Right'.
ie someone who does not wish to be identified as neo Nazi or neo Fascist, and true enough, in most cases they are NOT members of any such party. Just firm adherents of their policies.