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The word act, as used in the term Act of Congress, is a common, not a proper noun. The capitalization of the word act is deprecated by some dictionaries and usage authorities. Some writers, in particular the U.S. Code, capitalize Act.
capitalized: advocating or friendly to the principle of a federal government with strong centralized powers; especially: of or relating to the American Federalists. 4. often capitalized: of, relating to, or loyal to the federal government or the Union armies of the United States in the American Civil War.