The correct answer is C) Represent workers collectively to better protect the few rights they had.
The role of a labor union in the late 1800s was to represent workers collectively to better protect the few rights they had.
The formation of labor Unions in that time was a response and necessity to the poor working conditions in factories and manufacturing centers in the United States. The salaries of the workers were very low, the workplace had risks, there were unhealthy conditions to work, they worked long hours, and many times those places were overcrowded with no ventilation at all.