Congressional caucus as explained wikipedia.org
excerpt
A congressional caucus is a group of members of the United States Congress that meets to pursue common legislative objectives. Formally, caucuses are formed as congressional member organizations (CMOs) through the United States House of Representatives and governed under the rules of that chamber. They are not always called caucuses, and are sometimes titled coalitions, study groups, task forces, or working groups. In most other countries, the same kind of group is called an all-party parliamentary group. more