Quark (mirror)

From Memory Alpha, the free Star Trek reference

In the mirror universe, Quark (played by Armin Shimerman) was, like his counterpart in our universe, the owner of a bar on Terok Nor. A somewhat subdued individual, Quark bravely helped a number of Terrans escape from the control of the Klingon-Cardassian Alliance. However, his role in the operation was exposed by a captured slave, and he was arrested. Despite making a personal plea to Intendant Kira Nerys, she ordered his immediate execution. (DS9: "Crossover")

Quark's brother Rom later joined the Terran Rebellion to avenge his brother's death. (DS9: "Through the Looking Glass")