Worker treatment ileagal?

My roommate works in sears auto its hot here in texas. There's fans in the shop but its still hot. He passed out from hea exaustion on thejob... but that's not the problem. he was laying on th floor for half an hour unable to move in the middle of the shop. The only reason anyone helped was because he texted me and I told a different manager about the problem. The management in this store is terrible and I would like to take legal action to get one of them removed. Thease things happen weekly and I feel like its becoming an issue that the managers care more about the work getting done than the we'll being of the workers.