Leftists rhymes with:
adventists, chartists, clarinetists, cultists, dentist's, dentists', elitists, hypnotists, pragmatists, rightists, scientist's, scientists, scientists', separatists, statists
adventists, chartists, clarinetists, cultists, dentist's, dentists', elitists, hypnotists, pragmatists, rightists, scientist's, scientists, scientists', separatists, statists