Morgan was a member of the Brotherhood without Banners.
Biography
Season 6
Morgan, Lem and Gatins confront Ray's group of Faith devout, asking them for food and supplies. When Ray claims that he has nothing of true value to give them and that he has many mouths to feed, they leave, and possibly were responsible for the slaughter of everyone, except for Sandor Clegane.[1].
Morgan and Gatins educate Brotherhood Without Banners members Steve and Riddell as to how to best kiss a girl, when they are interrupted by Sandor Clegane, who kills them all with his axe[2].
Appearances
Template:Season Six Appearances
In the books
In the A Song of Ice and Fire novels, there are several characters whose first name is Morgan (Morgan Hightower, Morgan Liddle, Morgan Martell), but none of them are outlaws or members of the Brotherhood.