How might 1984 be a satire of communism?

Satire- "the use of irony, sarcasm, ridicule, or the like, in exposing, denouncing, or deriding vice, folly, etc." (dictionary.com)

According to my understanding of satire, 1984 is not a good fit. Orwell was very concerned about the rise of dictatorship as the political force of the 20th century, but he was equally concerned with the failure of language to deal with this reality. He discusses this in a paper entitled "Politics and the English Language," 1946. The major thrust of 1984 isn't about ridiculing vice or folly, but about predicting what will happen if we allow our knowledge of the past to be controlled by the government. You might be interested in viewing "Google Epic" to see what this could look like in our future. 1984 also discusses the attempt to limit the language that is available to us. The "Newspeak" dictionary is always shrinking, limiting the words and thoughts that are available to "us." Orwell discusses this in the aforementioned document.

The novel is probably best qualified as "dystopian" rather than "satirical," but I'm not sure the label is all that important. Exploring its meaning is critical.