The Jedi Militia was a guerrilla micro-army led by Quinto Solus, Jem Crystooine, and many Jedi who survived the Great Jedi Purge. Its ultimate goal was to ensure the destruction of the Empire and reestablishment of the Republic.
The group disbanded in 15 ABY after word of Luke Skywalker's New Jedi Order and the fall of the Empire reached the Militia's surviving members. Most of the Jedi Militia's members joined the fledgling Order.