The protections of the H-2A statute were adopted, inter alia, to ensure that the employment of foreign workers would not undermine the wages and working conditions of U.S. workers, and Congress provided legal services representation to secure the rights of H-2 agricultural workers under their employment contracts.
The statute makes sure foreign employers can determine anything they want. 
mnli hypothesis: The statute makes sure foreign employers can determine anything they want.  premise: The protections of the H-2A statute were adopted, inter alia, to ensure that the employment of foreign workers would not undermine the wages and working conditions of U.S. workers, and Congress provided legal services representation to secure the rights of H-2 agricultural workers under their employment contracts.