Answer:
The working class.
Step-by-step explanation:
Marx and Engels played a major role in introducing the idea of communism in Europe. Both entered into a collaboration and became members of socialist groups. They published the Communist Manifesto, which called for a working-class revolution to overthrow the capitalist system. They believed that under capitalism workers knew only poverty. They worked for long hours at low wages and lived in overcrowded lodgings. Both supported the working class as they believed it would defeat Capitalism and establish a classless society.