https://thinkprogress.org/labor-day-unions-wages-6bf2dc0be8bd#.2f1e28b2j
"Being in a union is particularly helpful for marginalized groups that tend to be paid less than white men. A new report from the Center for Economic and Policy Research found that black union workers earn wages that are, on average, 16.4 percent higher than black workers who aren’t in a union. The same is true for women: a report from the Institute for Women’s Policy Research found that women in a union earn 30.9 percent more than women who aren’t unionized."
