Milicja Obywatelska; Citizens' Militia, commonly abbreviated to MO, was the national police organization of the Polish People's Republic. It was created on 7 October 1944 by the Soviet-sponsored Polish Committee of National Liberation, effectively replacing the pre-war police force. The Citizen's Militia would remain the predominant means of policing in Poland until 6 April 1990, when it was transformed back into Policja.
The term milicja had been adapted from the cognate term, militsiya, used in several communist countries. The term is derived from militia, which in turn claims its etymology from the concept of a military force composed of ordinary citizens. Contrary to implied meaning, in most cases it represented rather a state-controlled force, used to exert political repression on the citizens.
Under both communist and post-communist governments, the Polish police system has traditionally operated under the auspices of national authority. Starting at the end of World War II, Poland fell under the influence of the Soviet Union, especially in 1947 and later in 1952, when the country's turn toward Stalinism brought the beginning of totalitarian rule. The highly centralized nature of the militia and its lack of any great power placed it largely under the control of the Security Bureau, which used it to instill fear in the local populace. The general training was offered in the town of Legionowo.
The Citizens' Militia was divided into a Public Order Department, Traffic Militia (Highway patrol), Criminal Investigations (Major crimes, forensics), Investigations Militia and an Infrastructure Security Section (Security of government buildings, airports, installations).
There were regional, district, city and local detachments of the force.
The ZOMO motorized riot police, which played the most visible role in quelling demonstrations in 1980 and 1981, were reduced in size somewhat by the early 1990s and renamed Preventive Units of the Citizens' Militia (Oddziały Prewencji Milicji Obywatelskiej—OPMO). OPMO forces are restricted to roles such as crowd control at sporting events, ensuring safety in natural disasters, and assisting the regular police. In theory, higher government authority would be required for large OPMO contingents to be used.