They literally are... . As where any individual or group of individual knowingly conceals a crime, they are complicit in that crime. Thus, where a body is established to hear evidence of criminal behavior and fails to notify relevant authorities of such, they are complicit in concealing the crime, therefore they are complicit IN THE CRIME.
Now, if the issue is civil... and it is an in-house body which seeks to mediate disagreements or to enforce the rules relevant SPECIFICALLY and EXCLUSIVELY to the entity at issue... then anyone or any group is entitled to hold such a hearing. But the terms handed down by such are not legally binding, except with they have written agreements and the agreement does not set aside any of their respective rights.
The issue here is that Islamists came looking for Government Sanction... in order to raise its perceived status in the hopes of establishing itself as a legally recognized body.