Reddit mentions of Ethics: An Essay on the Understanding of Evil (Radical Thinkers)

Zizek is a Communist. He was being intentionally ambiguous about his beliefs. His primary intention was to dispel the nonsense fantasy of the postmodern neomarxist. He is nonetheless critical of Stalinism and the like, but maintains a certain fascination with their ideological force (such as in the case of Lenin, the Jacobins, etc etc). He advocates a Decisionistic Anti-Humanist Politics of the Act. It would do you well to perhaps read Badiou, who was a very important influence on Zizeks own thought. These texts in particular:

http://www.cabinetmagazine.org/issues/5/alainbadiou.php

https://www.versobooks.com/books/513-the-idea-of-communism

https://www.versobooks.com/books/1872-the-communist-hypothesis

https://www.amazon.com/Ethics-Essay-Understanding-Radical-Thinkers/dp/1781680183

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As for Zizek, these sources would be good:

http://www.lacan.com/zizrobes.htm

https://www.versobooks.com/books/2445-in-defense-of-lost-causes

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Admittedly, if you are not familiar with Zizek, these will be very dense.

If we look into the far future:

All this SJW nonsense rests on the notion of Alterity (Othering) that has taken over the academy. One unintended consequence was victimology and the oppression olympics.

But things are moving on. The book by Badiou that renounces this ethical framework has really gained ground. There are some interesting days ahead.

Alain Badiou's Ethics is pretty good.