The right of workers in private employment to form unions and bargain collectively with their employers is guaranteed by the National Labor Relations Act (NLRA) and related federal laws. The NLRA is preemptive, meaning it supersedes state law in the areas it covers. However, in areas not covered by the NLRA, such as the rights of public employees and the rights of private employees who are not engaged in interstate commerce, the states are free to make their own provisions.
Like many states, Missouri has no comprehensive labor relations law of its own. The federal protections are the governing law of the state for private employees engaged in interstate commerce. Additional information on these protections is available.