The Briori were a species from the Delta Quadrant.
In 1937, the Briori abducted over three hundred Humans from Earth, including famous female pilot Amelia Earhart, and transported them to a planet in the Delta Quadrant to be utilized as slave labor. The Human slaves revolted, however, and overthrew their Briori masters, taking their weapons and technology, and eventually establishing a thriving settlement.
Fifteen generations later, in the year 2371, the settlement was discovered by the crew of the USS Voyager, along with Earhart and seven other Humans who were the only abductees who had been left in suspended animation. (VOY: "The 37's")