The Redbrand Hideout was the base of the Redbrands in Phandalin. It was a dungeon complex underneath Tresendar Keep.
In 1489 DR, The Party infiltrated the hideout in an attempt to put an end to the Redbrands' terror. They saved a lone goblin named Droop from his bugbear torturers, and also freed Mirna Dendrar and her two children.
The once-hideout is now integrated into the newly repaired Tresendar Keep.