Corsac Albain was a member of the White Fang. He was willing to help Adam Taurus by assassinating the Belladonna Family. After the attempt failed however, Corsac was arrested along with the other members of the White Fang that assisted with the attack.
Fennec Albain was Corsac's brother. They were always seen together. In "A Perfect Storm", it was shown that they work together very well and they combined their attacks in perfect sync in battle. Corsac mourns his brother's death by trying to attack Blake Belladonna and her family, as well as Sun Wukong, but was knocked out by Ilia Amitola.
Adam was Corsac's superior. Along with his brother, he seemed to agree with Adam's motive and was willing to tell him about Blake's location. In "Necessary Sacrifice", he decides to follow his plans despite Adam's current behavior though insinuated that Adam's leadership would not last since he and his brother merely saw him as a means to an end who has his faults and were willing to discard him if necessary.
Following his arrest, it is unknown if Adam knew he was arrested or even cared.
Corsac was Ilia's superior. He is aware of Ilia's previous friendship with Blake and wants to manipulate her into assassinating Blake's parents and bring Blake to Adam as it is necessary to their mission. Ilia betrayed him by knocking him out in "True Colors".
Corsac appeared to respect him even after he stepped down as the High leader of the White Fang. However, after receiving orders from Adam, he along with his brother, had no problem following orders to assassinate Ghira. In "Alone Together", he and Fennec were willing to fight him without hesitation.
Following the death of his brother, he violently charged at Ghira in a last attempt to kill him before he was electrocuted by Ilia.
- Volume 5 Directors Commentary Chapter 5