Vila Restal said Roj Blake was an Alpha grade, describing them as a "highly privileged group". He added that Blake "wouldn't last a minute in the Delta service grades where I grew up".
No one else was explicitly stated to be an Alpha. Servalan called Jenna Stannis "a superior grade citizen". (C: The Keeper) Joban mentioned Alpha grades, amongst others, as coming to view Blake as a hero figure, implying dissatisfaction with the Federation at all levels of society. (B: Shadow)