act in concert

Also found in: Financial.
References in classic literature ?
They were to act in concert, also, against all interlopers, and to succor each other in case of danger.
It is a great and pleasant feature of all such institutions in America, that they are either supported by the State or assisted by the State; or (in the event of their not needing its helping hand) that they act in concert with it, and are emphatically the people's.