Which of the following can be said about labor movements by the end of the 19th century?

One thing that can be said about labor movements by the end of the 19th century is: They had successfully organized skilled workers into unions.

The labor movement began at the beginning period of Industrial revolution. Since many business owners during this time treated skilled workers unfairly, they're inclined to form a union in order to achieve more stability for their economic and working condition.

Ineed more information to be honest