Who did Karl Marx predict would seize control of population?

Karl Marx predicted that the proletariat, or working class, would seize control of the means of production and ultimately the population. He believed that as capitalism progressed, the disparities between the bourgeoisie (capitalist class) and the proletariat would intensify, leading to class struggle. This struggle would culminate in a revolution where the proletariat would overthrow the bourgeoisie, establishing a classless society.