The phrase "a banner under which" is correct and usable in written English.
It can be used to describe a cause, movement, or ideology that groups or individuals rally around or support.
Example: "The activists marched together, united under a banner under which they fought for climate justice."
Alternatives: "a cause that represents" or "a symbol of unity for".
It is essentially a banner under which hacktivists and tech-savvy individuals with a political or social agenda can rally.
That stand was considered so natural that it became a slogan of the Republican party, and a banner under which northern workers carried arms during the American civil war.
As Freud said: 'It was not that we sank so low but that we never came as high as we had thought.' Today, Bush sees no such dangers; his civilisation is a banner under which he would have us all march without reservation.
And while recent circumstances have demanded that many of us take a break from banning men in order to ban white people instead (it's an emergency), 2014 demonstrated that "ban men" could be a rallying cry, a banner under which we could mass and direct our frustrations.
The flagship U.S. distribution business changed its name to Film Booking Offices of America, a banner under which R-C had released more than a dozen independent productions.
In doing so, the "New Age" became a banner under which to bring together the wider "cultic milieu" of American society.
What the events needed, he decided, was a "generic banner under which they could all sit".
March is National Women's History Month and now we have a perfect banner under which we can unite.
The opposition now sees Islam as a fine banner under which to march against its supposed enemies: bloggers "victimizing the people".
The opposition now see Islam as a fine banner under which to march against its supposed enemies; bloggers "victimising the people".
"No sadness, no desolation and, above all, no anger: that is too much to give to these men who are unable to offer anything … the I-couldn't-give-a-a-damn attitude is the only banner under which this team is capable of rallying.
