Marxists Internet Archive
Marxists Internet Archive: The Principles of Communism
This site from the Marxists Internet Archive provides the Principles of Communism, written by Frederick Engels, defines Proletariats in the second section of this page. Defines proletarianism, and then answers more detailed questions...
Wikimedia
Wikipedia: Proletariat
Wikipedia offers the definition of the Proletariat, the working class as defined by the Romans and by in Marxist theory.