An organization creates a special group that functions with the blessings of the parent organization.  A portion of that created special group begins to attack and rob establishments of their parent organization.  So the leader of the parent organization gathers the special group members together and asks them to perform the same acts onto a rival organization so that an important area will be protected.  Then the leader promised these special group members riches and guaranteed them extra areas as their reward.

1095
Catholic Church
Knights Templar
Turkish Empire
Jerusalem