The minimum wage in St. Louis was offficially rolled back from $10 an hour to $7.70, the statewide minimum on Monday. The law that did that, passed in May, is part of a broader trend of GOP state lawmakers pushing legislation that pre-empts local governments from setting their labor law regulations.

Since the start of 2016, 15 states have passed 27 laws pre-empting local labor standards, according a study released Monday by the liberal Economic Policy Institute.