The Prohibition Party (PRO) is a political party in the United States known for its historic opposition to the sale or consumption of alcoholic beverages and as an integral part of the temperance movement. It is the oldest existing third party in the United States and the third-longest active party.
Although it was never one of the leading parties in the United States, it was once an important force in the Third Party System during the late 19th and early 20th centuries. The organization declined following the enactment of Prohibition in the United States but saw a rise in vote totals following the repeal of the Eighteenth Amendment in 1933.