Guill

From Memory Alpha, the free Star Trek reference.

Guill was a Mari merchant who dealt in violent thoughts, which were outlawed on his homeworld. He ran the black market trade of this violent images. He probed B'Elanna Torres's mind to acquire violent thoughts, and tried to frame her as the carrier of the violent thoughts that caused a murder on the planet. Tuvok, after a mind meld with Torres, saw the probing done by Guill, and investigated him. Under the pretense of selling Guill more violent thoughts, he mind melded with him, but instead of transferring violent images, he caused Guill great pain, until he confessed his crimes, which absolved Torres. (VOY: "Random Thoughts")

Guill was played by Wayne Péré.