Why does Ostrinski believe the members of the proletariate are doomed to slavery?

This goes back to the defintion of wage earners;

"And so all over the world two classes were forming, with an unbridged chasm between them--the capitalist class, with its enormous fortunes, and the proletariat, bound into slavery by unseen chains. The latter were a thousand to one in numbers, but they were ignorant and helpless, and they would remain at the mercy of their exploiters until they were organized--until they had become "class-conscious."