He didn’t like capitalism, he didn’t like imperialism, he didn’t like injustice.
No, “didn’t like” is way to mild. He railed against those and other demons, and did it better than almost anyone else ever did. He was best known, probably, for The Open Veins of Latin America: Five Centuries of the Pillage of a Continent, whose sub-title pretty well tells you what it’s about. Personally, I liked best the books in which I first encountered Galeano, Memory of Fire.
His obituary in the New York Times is, alas, typically dull — which the man himself never was. http://www.nytimes.com/2015/04/14/books/eduardo-galeano-uruguayan-voice-of-anti-capitalism-is-dead-at-74.html