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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.
The blog referred me to Merriam-Websterâs Collegiate Dictionary (2005) and the APA Dictionary of Psychology; I checked both. There is no indication of disorders or syndromes being capitalized unless they are named after a person, such as Asperger syndrome. Even then syndrome is not capitalized.