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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.
Not really a crime question, but iff I'm not mistaken, if you are referring to a specific person then their job title is capitalized, but if you are referring to a general category of people, then its not capitalized. Federal Agent Mulder. but not. They've sent out a few federal agents.