Green Mountain Peace and Justice Party

Green Mountain Peace and Justice Party
AbbreviationGMPJP
FoundedMay 30, 1970 (1970-05-30)
HeadquartersDummerston, Vermont
IdeologySocialism
Anti-capitalism
Environmentalism
Political positionLeft-wing
Colors  Lime
Statewide Offices
0 / 6
Seats in the State Senate
0 / 30
Seats in the State House
0 / 150
Elected County Judges
0 / 42
Countywide Offices
0 / 42
Mayorships
0 / 8
Seats on the Burlington City Council
0 / 12
Other elected offices0 (June 2025)
Website
libertyunionparty.org

The Green Mountain Peace and Justice Party (GMPJP), formerly known as the Liberty Union Party (LUP) until 2021, is a socialist political party in Vermont, United States. LUP was formed in 1970 by progressives to contest the 1970 Senate election.

GMPJP is a self-proclaimed "non-violent socialist party". In 1995, LUP was described by The New York Times as the cradle of progressivism in Vermont.

GMPJP is the fourth-largest party in Vermont after the Democratic, Republican, and Progressive parties.

Notable past and present members include William H. Meyer, Peter Diamondstone, Bernie Sanders, Michael Parenti, and Mary Alice Herbert.