Historically, mass surveillance was used as part of wartime censorship to control communications that could damage the war effort and aid the enemy. For example, during the world wars, every international telegram from or to the United States sent through companies such as Western Union was reviewed by the US military. After the wars were over, surveillance continued in programs such as the Black Chamber following World War I and project Shamrock following World War II. COINTELPRO projects conducted by the U.S. Federal Bureau of Investigation (FBI) between 1956 and 1971 targeted various "subversive" organizations, including peaceful anti-war and racial equality activists such as Albert Einstein and Martin Luther King Jr.