Final answer:
Clement Greenberg endorsed Abstract Expressionism as an art critic, emphasizing the importance of pure painting and abstract forms of visual communication.
Explanation:
Clement Greenberg was an influential American art critic and collector who strongly advocated for Abstract Expressionism, particularly distinguishing between action painting and post-painterly abstraction. Abstract Expressionism was a prominent American art movement after World War II, focusing on pure painting and moving towards abstract forms of visual communication.
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