This was an example of Direct Transfer.
The Indian Relocation Act of 1956 which was also known as Public Law 959 was a United States law intended to encourage Native Americans in the United States to leave Indian reservations, acquire vocational skills and assimilate into the general population. For this reason it was also called the Adult Vocational Training Program.
I am not so sure what you mean by "what kinds of unions were formed", but if you're talking about the Civil War then I think the unions were Confederate and Union. The Confederates wanted to run the country with slavery while the Union fought against slavery. Do not quote me on that though.
