Hi, there's lots of room for more depth here, but fyi, there have been a couple of posts on this subject that can get you started in the meantime

• A comment in /r/propagandaposters:"Many black Americans fled to the USSR for this reason, and they spoke highly of the Socialist country after living there." Reason stated: "[Russia] was one of the few nations that appeared to care for how black people were treated in the early days." Is this true? featuring /u/kieslowskifan

• Did the Soviet Union have any black people living in it? What were their lives like?