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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.
What is to 'Capitalize'. Capitalize is an accounting method used to delay the recognition of expenses by recording the expense as a long-term asset. In general, capitalizing expenses is beneficial as companies acquiring new assets with a long-term lifespan can spread out the cost. Companies are allowed to take expenses they incur in the current period and deduct them over the long-term life of the asset.