The SEIU is the second largest labor union in the United States, behind only the National Education Association, with 1.9 million members in the U.S. and Canada, representing mostly healthcare and property services workers. Over the last decade it has also been one of the most successful with regards to expanding membership.
When asked why the SEIU would be interested in helping MMA fighters with expanding the Muhammad Ali Boxing Reform Act to MMA Brian Shepherd's told us that "we are always interested in advancing laws that are in the best interest of working people. We support all workers trying to get more protections on their jobs, and we don't think that just because someone's job is being an athlete it should be any different."