Kronstadt was lead by Stepan Petrichenko, a Tsarist that tried to join the White Army, failed, then lead a mutiny and managed to successfully join the Tsarists afterwards. The fact that a Tsarist-led rebellion occured in the middle of a bloody civil war against the Socialists doesn’t mean the Anarchists were oppressed, just people deliberately holding the civil war hostage so they could get preferential treatment.

You’ll also know that the Soviets were the only supporters of the Spanish Anarchists, sending many arms to help fight the fascists. The Soviets disagreed with Anarchists, but often fought alongside them.

You really need to actually dig into subjects before bringing them up as though you are familiar from simple wikipedia blurbs, because otherwise you end up defending the fascist Tsarists.