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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.
When you are referring to a specific piece of legislation, the name of the act should be capitalized. When you are referring to a general body of law, such as contract law, criminal law. property law, etc., it is not capitalized. 7 people found this useful.