Question

document 4
capital is dead labor, which vampire - like, lives only by sucking living labor, and lives the more, the more labor it sucks. — karl marx, capital 1
on the intended goals and effects of a communist revolution...
document 5 1
you are horrified at our intending to do away with private property. but in your
existing society, private property is already done away with for nine - tenths of the
population; its existence for the few is solely due to its non - existence in the
hands of those nine - tenths. you reproach us, therefore, with intending to do away
with a form of property, the necessary condition for whose existence is the non -
existence of any property for the immense majority of society.

document 7 1
the communists disdain to conceal their views and aims. they openly declare that their ends can be attained only by the
forcible overthrow of all existing social conditions. let the ruling classes tremble at a communistic revolution. the
proletarians have nothing to lose but their chains. they have a world to win. workers of the world, unite!

Explanation:

The documents involve Karl Marx's ideas on capital, communist revolution goals, and proletarian struggle, which fall under Social Science, specifically Politics (or History/Sociology). The content relates to political theory, social change, and Marxist ideology, so the subfield is Politics (within Social Science).

Answer:

Social Science - Politics (subfield)