How popular were fascist movements in America from 1930 to 1966? Were there offshoots of fascism in latin america and/or the US?

Most of the literature I've read so far that pertains to fascism is about fascism as a means to reject political systems (Bill Robert Paxton) and I was also wondering if fascism could be understood as a rejection of mainstream political ideology as well.

Anything to clarify this would be helpful, Thanks!