This document provides an overview of Marxist theories of international relations. It discusses key concepts in Marxism like the bourgeoisie and proletariat, and how Marx viewed economic factors as decisive in politics. It also summarizes variants of Marxist theory like dependency theory and world systems theory. Finally, it discusses the rise and fall of communist states in the 20th century and the effects Marxist thought had in shaping socialist movements and the Cold War global order.