Raya Dunayevskaya,a Russian emigre who was once Leon Trotsky's secretary in Mexico, emphasizes several aspects of Marxism that on the whole are unique. She emphasizes the relationship of world historic events to her interpretation of Marx's Hegelian dialectic and the movement from practice to theory. She goes beyond many interpreters in that she emphasizes the "humanist" core of Marx's ideas that go well beyond many of the more typical economic and social interpretations extant about alienation and exploitation. They go to the core of his democratic idea of "freedom" by emphasizing Marx's slogan of "revolution in permanence" (which is NOT Trotsky's "permanent revolution" formulation).