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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.
Capitalize only when giving the name of a specific judge or justice or when referring to a Justice of the United States Supreme Court. Capitalize Plaintiff, Defendant, Appellant, Appellee, and so forth when referring to parties in the matter or when the word is the subject of the court document or memorandum. EXAMPLES: Without admitting culpability, Plaintiff herein responds to Defendant's allegations of harassment . . .