Immigrates and some other factory workers were treated unfaily by their emplolyers. This unfailerness caused workers to join together and create labor unions.
Labor unions were organized association of workers, often in a trade or profession, formed to protect and
further their rights and interests.(wordnetweb.princeton.edu/perl/webwn)
Labor unions worked for better pay and hours. They made they points heard by stiking. Overtime tings changed but nothing too dramatic.
Cont....