The Blackshirts were established as the Squadrismo in 1919 and consisted of many disgruntled former soldiers. It was given the task of leading fights against their bitter enemies – the Socialists. They may have numbered 200,000 by the time of Mussolini's March on Rome from 27 to 29 October 1922. In 1922 the squadristi were reorganized into the milizia and formed numerous bandiere, and on 1 February 1923 the Blackshirts became the Voluntary Militia for National Security (Milizia Volontaria per la Sicurezza Nazionale, or MVSN), which lasted until 8 September 1943 Armistice of Cassibile. The Italian Social Republic, located in the areas of northern Italy occupied by Germany, reformed the MVSN on 8 December 1943 into the National Republican Guard (Guardia Nazionale Repubblicana, or GNR).
