Brenus, from the 1930s to 1960s American socialists developed the term "politically correct" for American supporters of the CCCP that always upheld whatever dogma that party promulgated, regardless of local considerations and developments for example. That is to say, the term was reserved for those perceived to have limited political interests in mind rather than some broader socialist principles.

TBH Sanders seems like the sort who would have held out Corbyn as politically correct.

Agree that Pannonian needs to change the record a bit.