Because they had many ways of doing things and were a very intelligent society.
-Hope it helps.
They knew the Greek idea of direct democracy. While they didn't necessarily apply the idea in their political system directly, they did apply some ideas that were shared with the Greeks that made the Roman political system more stable and better in the end.
Answer:
police by patrolling, security guards they also patrol, society as a whole bc of our social construct, religion by manipulation and personal belief, DEA by sting ops
