The union organised by Rom among the staff of Quark's bar in 2372, which defied Ferengi law by going on strike and brought the Ferengi Commerce Authority down on Deep Space 9.
The Guild of Restaurant and Casino Employees is the union founded in the Deep Space Nine episode Bar Association. When Quark cuts his workers' pay during a slow month, his brother Rom, encouraged by Doctor Bashir and by Chief O'Brien's tales of a union-leader ancestor, persuades the waiters and dabo girls to organise.
Unions are outlawed under Ferengi custom, so the strike draws Liquidator Brunt of the Ferengi Commerce Authority, who arrives with Nausicaan enforcers. Leeta and the other staff hold firm, and the picket line splits the station's officers, with Worf crossing it and O'Brien and Bashir refusing to.
After Brunt's thugs beat Quark, the brothers settle privately: Quark grants the demands and the union is officially dissolved. Rom then leaves the bar to become a station engineering technician.