The proposed Tribal Labor Sovereignty Act, which would have exempted businesses on native American reservations from FLSA, was successfully shot down on Monday. The bill would have affected more than half a million people employed by casinos on reservations across the country, and thousands of employees in other tribal businesses. Supporters of the bill say that the Act would simply restore the principle of tribal self-governance, and many tribes do have their own labor laws in place to protect workers. Those laws, however, typically have narrower definitions of collective bargaining rights than the FLSA.
See "Senate Bill to Curtail Labor Rights on Tribal Land Falls Short", Noam Scheiber, New York Times, April 18, 2018