It seems that the alt-right (and those that find them acceptable),  is trying to take over the word "populism".....it's been used to describe many different movements historically.  At this moment in time is describes a group, largely white, who feel that many others that are different from themselves are taking jobs and and the "good life" away from them.

It reminds me of how the word "Christian" has been taken over by the Fundamentalists.  A woman asked me recently if I was a Christian, saying:  "Oh,  I thought you were Catholic."