Allegedly left-wing bootlickers. Historically, they are more comparable to fascists than anything leftist.

Mutual aide is not really the issue with tankies, the problem is the authoritarianism. Mutual aide can be very effective when done properly. For example, anarchists tend to answer the question of “leeches” by giving them the resources to self-actualize, and if the “leech” does not care to do that, they can be kicked out of an anarchist community.