Bread and Roses Missouri

From left: Josh Mayfield, Christina Rios, Tyler White (in back), Ryan Lawson Maeske, and Noah Laster rehearse in "1877," a new play about the St. Louis General Strike of 1877 will premiere at the Missouri History Museum.

On a recent Sunday afternoon, about a dozen people gathered at the otherwise-quiet headquarters of the Service Employees International Union in Clifton…