Tailism, you know, when some small socialist or communist group things, "Hey, if we pal around with the racists, homophobes, transphobes, biggots a.k.a fascists (which will wind up with those groups thrown under the bus) we'll have a large enough section of the population to achieve Socialism or Communism." Failing to realize that all that would happen is that their movement would either be absorbed into the larger fascist movement or as soon as they finished killing off the blacks/browns, LGBTQIA+, actual communists and socialists, their own people would be cut out and destroyed with as much compassion as a doctor deals with a cancerous tumor.