There are many Ajahs, which run like Guilds within Baerlon and outisde. They now have their own Ajah Houses scattered throughout the city:
The Blue Ajah is a society dedicated to finding justice and cause. They have the most extensive Eyes and Ears network. The head of the Ajah is known as the First Selector.
The Red Ajah, which, before saidin was cleansed was devoted to hunting male channelers who would have become mad otherwise, is now the Ajah dedicated to Policing the Continent, patrolling borders with the Aiel and acting as an independant force of aid. The head of the Red Ajah is known as the Highest.
The Yellow Ajah specifies in Healing. The Head of their Ajah is known as the First Weaver
The Green Ajah is a fighting organisation, dedicated to fighting wars. Their leader is known as the Captain-General.
The Grey Ajah is one known largely for politics and mediation. The head of the Ajah is known as the Head Clerk
The Brown Ajah is responsible for the collecting and management of knowledge. Their leader is the First Chair, the head of a council.
The White Ajah is a society dedicated to logic and reasonning. Their head is known as the First Reasoner.
Each Ajah has Six Sitters, three Male, three Female, that sit on the Baerlon Council, the group that runs the School and the whole complex, which in turn governs all channelers of the One Power. It is headed by the Amyrilin Seat.
The Baerlon School is run by the thirteen Lodge Masters/Mistresses and also the Master/Mistress of Hall, the headmaster or headmistress.