I guarantee you they are NOT giving up their passports.
I knew a young man decades ago who was involved with the Nation of Islam. I don’t know what happened to him later, but he was very intelligent and I suspect he left the whole thing.
But he used to talk about leading ‘his people’ back to Africa. I’m not sure that my trying to explain to him that they wouldn’t go had much effect.
(One of my closest Black friends today says, ‘Africans live in huts and eat bugs!’
I try to explain to her that there are many beautiful and highly civilized cities in Africa now; but she wants nothing to do with it; she’s a very patriotic American.)