Getting some flak for the placement of Michel Foucault on this spectrum between Marx and Heidegger. So: remember that Foucault himself said: “I am simply a Nietzschean.” And: “Heidegger has always been for me the essential philosopher.”*
Heidegger was a member of the National Socialist Party in the 1930s and 1940s. Foucault was a member of the French Communist Party in the 1950s. Hence, as the graphic suggests, he is splitting the difference between Commie and Nazi.
* Sources: Foucault Live (Interviews, 1961-1984). Edited by Sylvère Lotringer. New York: Semiotext(e), 1989, p. 470 and p. 471.
See the episodes on Karl Marx and Martin Heidegger in the Philosophers, Explained series.
(And why Rand at the other end of the spectrum?)