A thug hired by the Bajoran widow Pallra in the episode Necessary Evil, who shoots Quark after he recovers a hidden list of collaborators and later tries to finish him off.
Trazko is a hired gunman in the second-season episode Necessary Evil. Pallra, widow of a Bajoran chemist murdered on Terok Nor during the occupation, pays Quark to fetch a strongbox hidden in the wall of her husband's old shop, and sends Trazko along to make sure nothing comes back to her.
Once Quark and Rom have the box open and Quark has read the list of names inside, Trazko steps in, shoots Quark in the chest and leaves with the list.
Quark survives, so Pallra orders the job completed. Trazko slips into the infirmary and starts to smother the unconscious Ferengi, but Rom walks in and lets out a shriek that brings help, and the killer is seized. His capture helps Odo close a case he first took up five years before.