Division is a "covert unit of the government" that routinely and forcibly recruit criminals into their organisation. It has gone rogue from the supervision of Oversight, and no longer takes their orders but those of Percy, who has designated the operations of Division as his choice since he was made its leader.
Little is known about the founding of Division, only what it has done since then. In the past, Division was used by the government to train assassins to kill those who pose a threat to the government's security or wellbeing. However, Percy has recently turned Division into an operation that takes on contract to kill individuals based on how great the reward is.
Nikita holds the record previously held by Michael for hitting a target whilst being the frthest distance away from it. Nikita was also the first recruit to escape Division, and she's going to "make sure [she's] not the last."