Following the Fall of Saigon on 30 April 1975, South Vietnam briefly came under the authority of a Provisional Revolutionary Government, a puppet state under military occupation by North Vietnam, before being officially reunified with the North under Communist rule as the Socialist Republic of Vietnam on 2 July 1976. Upon taking control, the Vietnamese communists banned other political parties, arrested suspects believed to have collaborated with the United States and embarked on a mass campaign of collectivization of farms and factories. Private land ownership was "transformed" to subsume under State and collective ownership. Reconstruction of the war-ravaged country was slow and serious humanitarian and economic problems confronted the communist regime.