SPINOZA and MARX (similarities)
Realm of necessity and realm of freedom
Liberation of slavery by the mind
The last chapters of Spinoza's Ethics deal with 'human suppression' (Ethics IV) and the 'power of reason and the human freedom' (Ethics V). The young Marx talks about this as the liberation of 'necessity'. Necessity, this are the fulfillment of needs, including food and safety. If these are fulfilled the kingdom of freedom can come.
Alienation
From inadequate to adequate images and ideas
Marx said that humans are estranged of their nature by the emergence of new ways of new production methods of industrialization. People would revolve against this to regain their freedom and to live according the optimal possibilites for their nature. Spinoza speaks in the samen spirit of ideas through the purification of the mind to live fully in accordance of one's natural possibilities.