Even on Hutta, even in communities built around theft and violence, there are outcasts. People who cross a line, committing acts so vile that their fellow criminals don't dare retain them; people who lose everything, and have nowhere to turn; people who outrage their Hutt overlords. These people are exiled to the swamps, and most die quickly… but not all.
Survivors learn what it takes to endure in the swamps‒respirators to cut down on toxic gas inhalation, medicinal compounds to counteract absorbed chemicals, specially treated clothes to alter one's scent, and blasters, of course, for self-defense. But no one can escape the changes wrought by living submerged in poison, and survivors suffer from paranoia, delusions and hallucinations. They become, as locals say, “bog people.”
For the most part, bog people aren't organized‒but they form packs and adopt new exiles to teach them the ways of the world. They are invariably violent (and most always were, even before becoming pariahs), and target anyone of any species in hopes of obtaining supplies.