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.

answer; the period of time known as the middle ages;

there were 6 major base camps.   the base camps were located in alva, fort reno, fort sill, the madill provisional internment camp headquarters, mcalester and camp gruber.