What organization did workers form in the mid-to-late 1800s to improve pay and working conditions

Many workers got together to organize what we now know as unions during the late 1800s. Those Unions were meant to solve their problems related to working conditions such as low wages and unsafe working conditions to name a few. The workers created at first local unions in single factories. Eventually, those unions ended up using strikes to demand what they wanted from their employers: a raise to their wages for some. Sometimes it was all about their working conditions safer.

you didn't give any answers to choose from so i can't with this but, i do know something that the mexican government would be worried about and that is the wall that donald trump is currently trying to get up.