"The young people think the old people are fools -- but the old people know the young people are fools." What literally device does this sentence use?

antistatis

Explanation: antistatis is the repetition of a particular word(s) in the same phrase, but every clause uses the word in opposite meanings.

samuel gompers was an extremely important person in the american labor movement, being him an employee all his life he devoted himself to fight for the rights of his pairs, he believed they all had the right to have better thing and that they all were working for them but the factory workers were greedy, ambitions and socialist people for him who he didn't have a good concept of.

he gave so many speeches and led so many strikes and protest to fight for equality which he considered employers didn't want to accept, so he had an absolutely negative opinion of them.