How did living in company towns make union membership more difficult for workers?
workers received free homes, food, and clothing.
company guards and agents spied on and reported workers.
workers made enough money that they did not need unions.
they could fire workers who moved away from the town.

Company guards and agents spied on and reported workers.

Explanation:

The company towns had standing troops of guards appointed by the company in order to deal with the situations of sudden and grieve revolts or similar actions by the employees. As the primary precaution to avoid such happenings, the company had banned workers from becoming members of unions. The workers who secretly joined such unions were secretly monitored by guards of the company based on the information provided by the agents.