Yup. Mutual aid and mutual security are closely tied. Any top down heirarchal structure, no matter how temporary you're told it will be, is against the interests of the workers/proletariat/commoner.

Communists worked closely with fascists in Italy to have anarchists killed when Mussolini was in power.

https://en.m.wikipedia.org/wiki/Anarchism_in_Italy

https://en.m.wikipedia.org/wiki/Assassination_attempts_on_Benito_Mussolini

Soviet Union General Secretary Joseph Stalin broke the Non-Intervention Agreement and League of Nations embargo by providing material assistance to the Republican forces, becoming their only source of major weapons.

From August 1936 onward, over one ship per day arrived at Spain's Mediterranean ports with Russian aid: munitions, rifles, machine guns, hand grenades, artillery, trucks, Soviet agents, technicians, instructors, and propagandists.