Divide and rule is a strategy used by empires to control territories under subjugation. From the Wikipedia article:
Elements of this technique involve:
- creating or encouraging divisions among the subjects to prevent alliances that could challenge the sovereign
- aiding and promoting those who are willing to cooperate with the sovereign
- fostering distrust and enmity between local rulers
- encouraging meaningless expenditures that reduce the capability for political and military spending
Against a government which has no qualms instilling fear and suspicion among its people for a chance at staying in power, there is only one thing to do.