Answer:
Marxist theorists. Functionalist theorists.
Explanation:
Karl Marx introduced the concept oh Conflict Theory, with it he explained that society is in a perpetual state of conflict between classes. He held that social order is maintained by domination and power. So, for him social institutions only exist to empower privileged positions in the society.
On the other hand, functionalism establish that every social organ has a function and its existence is justified for the need in to society. So, specific functions requires specific and essential tasks that only can be made for the specific social institution. Functionalism make an analogy with biology, as well as organs have their specific functions to the body, social institutions have it too to society.