- Sigmund Freud
- Friedrich Engels
- Aristotle
- Gareth Stedman Jones
- Alexis de Tocqueville
- Jean-Jacques Rousseau
- John Locke
- John Stuart Mill
- David Hume
- Ernesto Che Guevara
- Herodotus
- Thomas Hobbes
- Max Weber
- Georg Wilhelm Friedrich Hegel
- Arthur Schopenhauer
- Émile Durkheim
- Vladimir Lenin
- Francis Bacon
- Leon Trotsky
- Samuel Moore