But so often it happens that the working class and the owning class ally to reduce the power of the working class. They rarely seem to ally against members of the owning class.
At the battle of Plataea during the Second Greco-Persian War, a number of Greek city-states fought on the Persian side. Why? Because the Persians were so big and powerful they were surely going to win.
Because the owning class have really good PR(you can also be like us if you just work hard enough) and can afford better physical segregation and legal protection against the working class.