Charlie Chaplin is known for being a whistleblower, an engaged movie director, indeed he made several engaged movies, Modern Times is one of them.
Modern Times can be considered as a critique, a manifesto against the inhuman and degrading working conditions that the factory workers had to face during the 30s.
Despite being a comedy, Modern Times tackle the issue of huge lack of social justice in America during that time period. For example we can at some point in the movie factory workers striking their factory. and demonstrating in the street because they yearn a decent living wage. Charlie Chaplin is himself, living like an outcast in a run-down house.
To conclude, Modern Time is a outspoken movie that is fairly thought-provoking movie about the American gig economy.