The CoC is not really a MRO such as ABATE, but biker rights are often discussed and are paramount to the organization. While Patchholders may belong to an MRO, they don't have a united membership of patch holders. Where most MROs are made of independents, ownership groups, MCs, RCs, MMs, and a wide range of people... the CoCs are typically club oriented.

The CoC may vary from region to region in makeup, size, and strength but the overall mission of the CoC is unity in the motorcycling world. The CoC exists to bring communication through clubs, improve the motorcyclist image, support legislation for the betterment of motorcycling, and protect our biker rights in the court system. In some areas the organization may also be a sanctioning body for new or probate clubs in that region.  The CoC is also a good place to meet some of the people in the clubs in your area. 
*Note* Some do require an invite to attend, so you will want to check and see.

National CoC......  AIM NCOM