A recent letter from the House Subcommittee on Health, Employment, Labor, and Pensions to the Department of Labor has called for the Department to close loopholes that allow Work Centers to operate like unions, but without any of the federal oversight laws that apply to the unions, like financial transparency and prohibition from intimidation practices.
In a hearing in November, Secretary Acosta said that the Department of Labor was looking into worker centers, but no action has been taken to date. Hopefully this letter pushes change to the forefront.
Read more about it here.