a political party at the forefront of an action or movement, often seeking to create a single-party

a usually Marxist political party that views itself as the vanguard, or organizational leader, of proletarian revolution

A vanguard party is a political party or grassroot organization at the forefront of a mass action, movement, or revolution. The idea of a vanguard party was developed by Vladimir Lenin, most prominently in What is to be Done?, a political pamphlet first published in 1902.

Vanguard Party, originally known as the Vanguard Nationalist and Socialist Party, a socialist political party in the Bahamas. The party was founded in 1971 by a group belonging to the youth organization of Progressive Liberal Party. The party was inspired by the Black Panther Party in the United States.

The Vanguard Party (Partai Pelopor) is a political party in Indonesia. It was founded in 2002 and is led by Rachmawati, a daughter of Indonesia's first president, Sukarno, and sister of former Indonesian president Megawati.