Conflict between social or economic classes (especially between the capitalist and proletariat classes) WordNet 3.0 & Open English WordNet

In political science, the term class conflict refers to the political tension and economic antagonism that exist among the social classes of society, because of socioeconomic competition for resources among the social classes, between the rich and the poor. Wikipedia

A conflict between socio-economic groups Wikipedia Disambiguation

Tension or antagonism which exists in society due to competing socioeconomic interests Wikidata

Conflict between social or economic classes (especially between the capitalist and proletariat classes); the active expression of a theoretical class conflict looked at from any kind of socialist perspective. Wiktionary

Struggle between classes. Wiktionary (translation)