Class struggles lead to alienation

Marx often talks about class struggles:
Conditions of production-resources available to society
Means of production- equipment , tools, machinery, & raw material
Production relations - owners and workers
Society's ruling class sets the norms for right/wrong
History is a struggle of who owns the means of production
In Capitalist society: bourgeoise vs. proletariats

Alienation :
Labor - Consciousness and labor interact with each other
In capitalism, the worker labors for someone else
Labor then becomes external to the worker - alienation
What the worker creates, the worker must then buy
Exploitation- pocketing the profits
Contradictions in capitalism: the goal is to create commodity by employing as few workers as possible .
But with more people unemployed, less people to buy the. Goods, which will cause economic crisis
Marx said that capitalism will eventually self destruct