Which act removed anti-combination language from the Sherman Anti-Trust Act in relation to unions?

The Clayton Act is the correct answer because it specifically addressed and removed the anti-combination language in the Sherman Anti-Trust Act as it pertains to labor unions. Prior to the Clayton Act, unions were often viewed as illegal combinations that restrained trade, which led to extensive legal challenges against organized labor. The Clayton Act of 1914 clarified that the antitrust laws were not intended to restrain labor activities, thereby providing unions with the legal protection to organize and engage in collective bargaining without fear of being prosecuted under antitrust laws. This was a pivotal moment for labor rights, as it recognized unions as legitimate actors in the economic landscape and allowed them the ability to operate without being impeded by antitrust limitations that were originally aimed at business combinations.