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

In 1974, political scientist Michael Parenti was the party's candidate for election to the House of Representatives; he placed third with 7.1 percent of the vote.

[7] Despite Liberty Union co-founder, Peter Diamondstone, appearing biennially on the ballot from 1970 through 2016, none of the party's candidates were elected during that period.

[13] In 2009, David Van Deusen, endorsed by LUP and the Vermont Progressive Party (VPP), won a contested race for a seat on the Moretown Select Board.

This victory represented an electoral high water mark for the Liberty Union Party (previous Liberty Union wins included a Representational Town Meeting Delegate in Brattleboro, and a single Justice of the Peace position some decades earlier).

In VT State Senate races, Ben Bosley won 13.9% of the vote for Grand Isle district.

[citation needed] In the 2016 Vermont gubernatorial election, former Boston Red Sox and Montreal Expos pitcher Bill "Spaceman" Lee ran as the Liberty Union's candidate for governor.

Lee supported single payer healthcare and ran far to the left of the Democratic Party while at the same time remaining an advocate for the right of Vermonters to own firearms.

In other 2016 races, Murray Ngoima received 3.9% of the vote for Treasurer, Mary Alice Herbert 9.7% for secretary state, Marina Brown 4.7% for Auditor and Rosemarie Jackowski 3.7% for attorney general.

[21] In September 2021, the party changed its name from Liberty Union to Green Mountain Peace and Justice.

[22] In 2022, under its new name, Green Mountain Peace and Justice Party nominees ran only for US Senate and Lieutenant Governor seats.