The Neighborhood Association (隣組 Tonarigumi?) was the smallest unit of the national mobilization program established by the Japanese government in World War II. It consisted of units consisting of 10-15 households organized for fire fighting, civil defense and internal security.
Neighborhood mutual-aid associations existed in Japan since before the Edo period. The system was formalized on 11 September 1940 by order of the Home Ministry (Japan) under the cabinet of Prime Minister Fumimaro Konoye. Participation was mandatory. Each unit was responsible for allocating rationed goods, distributing government bonds, fire fighting, public health, and civil defense. Each unit was also responsible for assisting the National Spiritual Mobilization Movement, by distribution of government propaganda, and organizing participation in patriotic rallies.
The government also found the tonarigumi useful for the maintenance of public security. A network of informants was established linking every neighborhood association with the Tokkō Police to watch for possible infractions of national laws, and suspect political or immoral behavior.