In the Gulf, Colorado & Santa Fe Railway Co. v. Dennis case in 1911, the U.S Supreme Court ruled on a dispute involving an employee's injury claim against his employer, a railway company. The plaintiff, Dennis was injured while working for the defendant and sought compensation under Texas state law which held employers liable for injuries caused by negligence of any fellow servant or other employees. The railway company argued that this state law conflicted with federal laws regulating interstate commerce and therefore should be invalidated under the Supremacy Clause of Constitution. The Supreme Court disagreed with this argument stating that there was no conflict between federal and state laws as they were designed to address different issues - federal laws regulated operational safety standards whereas Texas' law dealt with personal injury liability among employees within companies operating in its jurisdiction. Therefore, it upheld Mr.Dennis's right to seek damages from his employer based on Texas State Law without violating Federal Interstate Commerce regulations.

The dissenting opinion in the case of Gulf, Colorado & Santa Fe Railway Co. v. Dennis argued that the court majority had incorrectly interpreted and applied the law regarding employer liability for employee injuries. The dissent contended that under Texas law, which was applicable in this case, an employer could only be held liable if it failed to exercise reasonable care to ensure safety at work or if it knew about a dangerous condition but did not take steps to correct it or warn employees about it. In this particular case, there was no evidence presented showing negligence on part of the railway company nor any proof indicating they were aware of a hazardous situation yet chose not to rectify or inform their workers about it. Therefore, according to the dissenting justices' interpretation of Texas laws and principles governing workplace safety and employers' responsibilities towards their employees’ well-being; holding Gulf, Colorado & Santa Fe Railway Co responsible for Mr.Dennis's injury seemed unjustified.