Week 4 part(3)

Here’s an article on strikebreakers, or “scabs” and you can see how hated they were. It seems like the unions were constantly losing ground at this time. What enabled unions to eventually make gains like they are capable of today? 

http://digitalcommons.calpoly.edu/cgi/viewcontent.cgi?article=1040&context=hist_fac

(at least 100 words)