> My knowledge of unions in the U.S. is neither deep nor broad
See:
http://monthlyreview.org/books/whyunionsmatter.php
In this new edition of Why Unions Matter, Michael D. Yates shows why unions still matter. Unions mean better pay, benefits, and working conditions for their members; they force employers to treat employees with dignity and respect; and at their best, they provide a way for workers to make society both more democratic and egalitarian. Yates uses simple language, clear data, and engaging examples to show why workers need unions, how unions are formed, how they operate, how collective bargaining works, the role of unions in politics, and what unions have done to bring workers together across the divides of race, gender, religion, and sexual orientation.