In December 1947, United States National Security Council (NSC) Directive 4-A "secretly authorised the CIA to conduct these officially non-existent programs and to administer them" in such a way that "removed the U.S. Congress and public from any debate over whether to undertake psychological warfare abroad". A few months later, the NSC replaced directive 4-A with directive 10/2, creating the Office of Policy Coordination (OPC, initially euphemistically called the "Office for Special Projects"), the covert action arm of the Central Intelligence Agency (CIA). The OPC's charter unambiguously called for "propaganda, economic warfare; preventative direct action, including sabotage, anti-sabotage, demolition and evacuation measures; subversion against hostile states, including assistance to underground resistance movements, guerrillas and refugee liberations groups, and support of indigenous anti-communist elements in threatened countries of the free world." In the words of career intelligence officer William Corson, "no holds were barred… all the guys on the top had said to put on the brass knuckles and go to work."