A coordinating body that oversees or represents a group of smaller organizations, often in business, labor, or non-profit contexts.
The umbrella organization brings together member groups from across the country.
連合体 emphasizes a union or federation of equal members, while 統括組織 stresses a central coordinating or supervisory role.
本部 is a headquarters or main office, often for a single organization, whereas 統括組織 is an overarching body that unites multiple separate entities.
Compound of 統括 (tōkatsu, 'unification, overall control') and 組織 (soshiki, 'organization'). The exact historical derivation is uncertain, but the term is a straightforward modern coinage.