The Scavengers were a group of people who wanted revenge on the ADA after the ADA took down the extractor, causing mass amount of damage to the island. After Aurora's home was destroyed, she wanted revenge and created The Scavengers.
After the ADA took down the Extractor, Aurora created the scavengers to get revenge on the ADA because of the damage caused to the island. The Scavengers built 3 lasers to shoot at a crystal lodged in Daring Dam and to release the corals held inside.
In season 5, The Scavengers have successfully destroyed Daring Dam and released the corals. Meanwhile, they built a rocket to send The Bears to Omega, where they would not survive. Martin went to stop them, but got put in the rocket and launched to Omega.
Zero used the Reality Jumper to destroy Withered Wasteland, destroying The Scavengers and killing their leader: Aurora.