If you didn’t have to drop out of elementary school to go work in a sweatshop, you owe Chicago’s 19th-century labor activists a debt of thanks. Usually it’s the men of the movement who dominate the narrative of Haymarket Square—the site of May 4, 1886 rally where seven policemen were killed in a bomb blast. Underscore Theatre’s musical Haymarket focuses instead on Lucy Parsons (Bridget Adams-King), the wife of activist Albert Parsons. Adams-King has a voice fit for a woman of extraordinary strength and indomitable will. Haymarket runs through Sept. 16 at Theater Wit, 1229 W. Belmont Ave.; $15-$45; TheaterWit.org