What was the main idea Marx was trying to get through?

I saw someone else already answered this question, but I just wanted to add something to his. I think Marx's main idea was to make the government richer and thus, more powerful. Individuals could not own or rent lands. This restricted one's ability to do business and make money. Transportation system and credit were centralized to the government. The gap between poor and the not-so-poor was even closer thanks to heavy progressive income taxes. (meaning that the more you make, the higher the tax rate. it's quite similar to our tax system, it's just more progressive, rates are steeper for higher income) With all these, the state could become more powerful than the rest of the country. This structure reminded me of the proletariats and bourgeoisie: the ones that sell their labor and the ones that need those labor for the land that they own.