That’s not correct, though. MLs don’t support fascist regimes.
MLs have a long history with deep theoretical frameworks, which is why just calling them fascists and right-wingers gets you exactly nowhere with them, and ignores their genuine Proletarian perspective.
Even this post, for example, has people correctly pointing out how the USSR kept the Nazi scientists on a tight leash, then deported them after they had sufficient intelligence, while the western states kept the Nazis and allowed them into important offices.
If you want to genuinely combat MLs, then you have to appeal to them from a materialist perspective, and showcase sound theoretical basis to defeat Capitalism and Imperialism globally.
If you just dismiss MLs as right-wingers, you genuinely showcase a lack of understanding of leftist history in general, and don’t actually succeed in combating ML mindsets.