Pax Mongolica
Equality is Fantasy
Yeah but basically unions are formed out of "Marxist struggle".
They can be, but most self-identified Marxists are advocating more than just unionization of labor. Typically, when someone is just pro-labor union, they don't call themselves "Marxist." That has a very specific connotation.
Marxism can be studied for the purpose of understanding how some labor reforms were pushed forward, but actual Marxist activists are advocating for revolution.