This is huge and there are books written on this...
We are thinking about better wages, living wage in part so that families didn't have to rely on Child labor in the factories, etc.
I'm also thinking better working hours, 8 hour workday, weekends, etc were all goals of the Unions in the late 1800s
Safe working environment was also an issue, some sort of workmans compensation for injuries on the jobs.
all sorts of stuff like that.
An example would be the Great Railroad strike of 1877, over employers reducing wages, ect.