Answer:
bourgeoisie, proletariat
Explanation:
The ruling class was called the bourgeoisie who owned the businesses. In sociological terms they belonged to the upper middle class of society. They employed the working class.
The working class is called the proletariat who worked under the bourgeoisie. Marx argued that the poletariat was almost like the property of the bourgeoisie. According to Marx the uneveness of wealth would lead to a revolution and topple capitalism.