The Police Department/System was first established by? 

1. Hazrat Ali (R.A.)
2. Hazrat Abu Bakr (R.A.)
3. Hazrat Umar (R.A.)
4. Hazrat Usman (R.A.)

 Caliph Umar (R.A.) created the Shurta (Islamic police) in 639 CE to maintain order in expanding Muslim territories. Headquartered in Medina, it handled crime prevention and public safety. The Diwan al-Jund (military registry) and night patrols were also his innovations. These reforms are documented in Al-Kamil fi al-Tarikh by Ibn al-Athir, showing Umar’s administrative genius during his 10-year caliphate (634-644 CE).