The technologically advanced inhabitants of the planet Ledos, who share their world with the primitive Ventu but had been cut off from them for centuries by an alien energy barrier.
The Ledosians are a warp-capable humanoid species who appear in the Voyager episode Natural Law. Their planet, Ledos, includes a large region sealed beneath an energy barrier erected centuries earlier by unknown aliens to shelter the Ventu, the world's indigenous people.
In 2377 a shuttle carrying Chakotay and Seven of Nine breaks through the barrier and crashes. To get them out, Voyager brings the barrier down, and Ledosian scientists eagerly enter the territory for the first time, planning to study its people and exploit its resources.
Janeway decides that the Ventu should be left as they were, and removes the Ledosian expedition by force of transporter before the barrier is restored. In the same episode Tom Paris is ordered by Ledosian officials to take piloting lessons after a traffic violation.