Hi Brystle,
Have you tried to contact the organisation through their public domain? If they are a 501 organisation they will have direct contact streams outside of Facebook, so you should be able to make contact with them.
You can report the group to Facebook admin, but groups on Facebook are self-moderated and generally don't have to give a reason, or answer to Facebook regarding who they block or why. If you need more advice on this, please email our advisor team at
[email protected]