The Scrapper Guild is a group of humans and aliens that work to obtain useful scraps, such as parts from ships and vehicles. Before the Empire took control of their home planet Bracca, they had been engineers. As said by Prauf, "Engineers, became scrappers. The workers... they just started getting worked" (Star Wars Jedi: Fallen Order)
Prior to the reign of the Empire, the scrapper guild was a thriving industry, the most profitable on the entirety of Bracca. Once the Empire took control of Bracca and the Scrapper Guild, working conditions became harsher, pay became lower, and the lives of the workers overall became more difficult.