Deny it as may the cunning capitalists who are clear-sighted enough to perceive it, or ignore it as may the torpid workers who are too blind and unthinking to see it, the struggle in which we are engaged today is a class struggle, and as the toiling millions come to see and understand it and rally to the political standard of their class, they will drive all capitalist parties of whatever name into the same party, and the class struggle will then be so clearly revealed that the hosts of labor will find their true place in the conflict and strike the united and decisive blow that will destroy slavery and achieve their full and final emancipation.
The Socialist Party and the Working Class (1904)