proletariat

Short definition from Wiktionary

Noun

1. 1
   The lowest class of society; also, the lower classes of society generally; the masses.
2. 2
   Wage earners collectively; people who own no capital and depend on their labour for survival; the working class, especially when seen as engaged in a class struggle with the bourgeoisie (“the capital-owning class”).
3. 3
   The lowest class of citizens, who had no property and few rights, and were regarded as contributing only their offspring to the state.