Trouble can often be traced to a single strong individual - the stirrer, the arrogant underling, the poisoner of goodwill. If you allow such people room to operate, others will succumb to their influence. Do not wait for the troubles they cause to multiply, do not try to negotiate with them – they are irredeemable. Neutralize their influence by isolating or banishing them. Strike at the source of the trouble and the sheep will scatter.
Wisdom in a nutshell:
Within any group, trouble can be traced to a single source, the unhappy, chronically unsatisfied one who stirs up dissension and infects the group. Recognize troublemakers by their complaining nature. Separate him from the group.
In every group power is concentrated in the hands of one or two people. Human nature shows people will orbit around a single strong personality.
Beware if they can return to harm you, however keep them close to disarm them.