A group of Megans.
The trial.
The Megans are an ageless species of the planet Megas-Tu that specializes in the ethics of magic and wizardry.
During the 13th century CE, the Megans travelled to Earth where they would would assist humans with the art of magic, and would eventually be responsible for the ancient legends of witches and warlocks.
By the 17th century CE, the Megans settled in Salem, Massachusetts after realizing that humans only wished to use them to serve greed and lust. They chose to live their lives there as "normal men" to avoid the accusations of being "devils, warlocks and evil sorcerers." Unfortunately, while living in Salem, several of the Megans made mistakes and used their powers, and were burned for it as witches during the Salem witch trials.
Those Megans who escaped the witch trials were forced to leave Earth and return to their homeworld, where they remained bitter and fearful of humans.
In 2269, the USS Enterprise made contact with the Megans, but due to the Megans distrust of humans, the Enterprise crew was placed in a recreation of a Salem witch trial. (TAS: "The Magicks of Megas-tu")
- This episode has similarities with "Encounter at Farpoint" (TNG), with Q putting Captain Picard on trial for being a violent and child-like race.