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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.
Answer by Anna Rino. Confidence votes 25.3K. It is capitalized at the beginning of the sentence or when it forms part of the proper noun or when it precedes a person's name or when it is used as a direct address. Examples: Special Education Teacher Anna.