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.
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.