I have some pending ACL requests from someone who is no longer a Fedora Packager (ie no longer in the Packager group), and it does not seem possible to Reject or Obsolete or clear their requests in the Web interface at least.
The error given is 'User "[userid]" is not in the Packager group'. This seems to be a regression compared to pkgdb 1.
Fixed in https://git.fedorahosted.org/cgit/pkgdb2.git/commit/?id=35603bcb99d5df20d3b09dfdc6ace74d0d2afc54