under the banner of

under the banner of something

using the support or protection of a belief or idea They're part of a group that goes under the banner Youth Against Crime.
See also: of

under the banner of something

if you do something under the banner of a belief or idea, you say that you are doing it in order to support that belief or idea The pro-lifers are campaigning under the banner of traditional family values.
See also: of
References in classic literature ?
Archers from the New Forest and the Forest of Bere, billmen from the pleasant country which is watered by the Stour, the Avon, and the Itchen, young cavaliers from the ancient Hampshire houses, all were pushing for Christchurch to take service under the banner of the five scarlet roses.