In 1873, Congress enacted the Fourth Coinage Act ("The Crime of '73") which embraced the gold standard and de-monetized silver. Western mining interests and others who wanted silver in circulation labeled this measure the "Crime of '73". For about five years, gold was the only acceptable metallic standard in the United States.
Today, Acts of Congress are designated in the form: Public Law X-Y where X is the number of the ordinal Congress and Y is the number of the chronological order of the Act in that Congress.