umbrella organization/group/agency etc
From Longman Dictionary of Contemporary Englishumbrella organization/group/agency etcumbrella organization/group/agency etcan organization that includes many smaller groups → umbrellaExamples from the Corpusumbrella organization/group/agency etc• La Raza is an umbrella group of almost 200 Hispanic advocacy groups.• About 130 professional and human-rights groups are folded into Concilio Cubano, a rickety umbrella group set up last year.• The umbrella group we'd formed in 1987 had fallen into abeyance, but the name still meant something.