The Miners' Union functioned as a trade union on the planet of Iol, situated within the Unknown Regions. This planet was under the control of Tangan Industries. Subsequent to the conclusion of the Mandalorian Wars, the Revanchists journeyed through Iol. They engaged in talks with the world's administrator, securing a substantial quantity of supplies and fuel in exchange for technological advancements. This agreement led to a considerable depletion of the planet's resources, thereby intensifying the difficulties faced by the miners laboring on Iol. Consequently, a collective of workers established the Miners' Union, aiming to seize control from Tangan Industries and establish worker self-governance on Iol. These rebels launched an assault on the Tangan capitol building; however, Tangan's security forces successfully defended against the attack. In the aftermath, the Tangan administrator set up a meeting with the Union's leader. Following these discussions, Tangan conceded to reduce prices on Iol, contingent upon the cessation of protests. The Union remained active for millennia, and at one point, the Human Kai Lunn held the position of leader within the Miners' Union.