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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.
CAPITALIZATION.52: Capitalize the names of the state and city legislative bodies when they are part of. the full name; otherwise, leave them lowercase. She is a long-time member of the Los Angeles City Council. The city council will vote on the controversial measure.