And your answer let me know alienation was not just a theory. It was built right into the theory of structural functionalism.

Alienation describes the separation of things that naturally belong together; and the placement of antagonism between things that are properly in harmony.

Structural Functionalism is a theoretical understanding of society that posits social systems are collective means to fill social needs. In order for social life to survive and develop in society there are a number of activities that need to be carried out to ensure that certain needs are fulfilled. In the structural functionalist model, individuals produce necessary goods and services in various institutions and roles that correlate with the norms of the society.