During the late 19th century, what pracitces were used by employers against workers?

employers used two tactics against works: yellow-dog contracts and blacklisting. Yellow dog contracts is an agreement between the worker and employer where the worker agrees to certain conditions of employment as well as to not be a member of any labor union.

during the 1920s the goal of the united states was not letting business collide or go down or even compete this was due to wwl