...they evaluate and classify different currents according to some external and secondary manifestation, most often according to their relation to one or another abstract principle which for the given classifier has a special professional value. Thus to the Roman pope Freemasons and Darwinists, Marxists and anarchists are twins because all of them sacrilegiously deny the immaculate conception. To Hitler, liberalism and Marxism are twins because they ignore “blood and honor”. To a democrat, fascism and Bolshevism are twins because they do not bow before universal suffrage. And so forth.
Trotsky wrote about TESCREAL millennia ago:
Sounds like https://en.wikipedia.org/wiki/Out-group_homogeneity