The Party for Socialism and Liberation (PSL) is a communist party in the United States. PSL was established in 2004, when its members split from the Workers World Party. The group believes that a socialist revolution is necessary to overthrow capitalism and establish socialism. The organization works toward this end by organizing and participating in local protests, running candidates in elections, and political education favoring a revolutionary socialist vanguard party.
PSL protesters at the 2016 Democratic National Convention
Third party, or minor party, is a term used in the United States' two-party system for political parties other than the Republican and Democratic parties.
Currently, the Libertarian and Green parties are the largest in the U.S. after the Republican and Democratic parties. Shown here are signs of their 2016 campaigns, respectively.