I remember reading that there was also a split in the zionist movement in the early Soviet Union because while zionism always contained elements that were more domineering and supremacist, a large part of zionism was a simple desire for safety from the institutional violence that Jews had been subjected to over the centuries, and so the movement split into those who still wanted an explicitly Jewish state of their own and those who believed that the secular Soviet Union was sanctuary enough.

But I don't remember any more details than that, nor do I know if what I read was accurate to begin with.