The Shinto Directive was an order issued in 1945 to the Japanese government by Occupation authorities to abolish state support for the Shinto religion. This unofficial "State Shinto" was thought by Allies to have been a major contributor to Japan's nationalistic and militant culture that led to World War II. The purpose of the directive was ostensibly based in ideas of freedom of religion and separation of church and state.
After the Second World War, it was generally understood by Allied students of Japanese culture and religion that Shinto in the form it took leading up to and during the war was social propaganda and was used as a tool of ultra-nationalism and a disguise for militarism. However, even though this support of Shinto was defined as non-religious propaganda, in the Allied schools it was being taught as religious in nature. Thus, it was US policy regarding post-surrender Japan to abolish "State Shinto," which was not and never had been a formal Imperial policy. The directive, SCAPIN 448, was drafted by the US military's expert on Japanese culture and religion, Lieutenant William K. Bunce, U.S.N.R. and was issued on December 15, 1945, with the full title of "Abolition of Governmental Sponsorship, Support, Perpetuation, Control, and Dissemination of State Shinto (Kokka Shinto, Jinja Shinto)". There were two translations given for the term "State Shinto": the first ("Kokka Shinto") was a neologism, and the second ("Jinja Shinto") referred to Shinto shrines, which up until 1945 had been secular wards of the state.
According to the directive, State Shinto was to be stripped of public support and of its "ultra-nationalistic and militaristic" trappings. With the severing of its traditional state patronage, the Shinto establishment required privatization, and to that end any Shinto entity that had been dependent on public funding but not actually part of the secular administrative structure was to be assimilated either into what the directive calls "Sect Shinto" with no special privileges above the other popular faiths, or to be reformed, with conditions stipulating complete and permanent loss of government support, as "Shrine Shinto," which was to be supported by voluntary private donation only.