From the Charter:

"The co-chairs are empowered to restrict the participation of someone who seriously disrupts the working group. Generally, the participant should first be warned privately, and then warned publicly before such a restriction is put into place; in extreme circumstances, this requirement may be bypassed. This restriction is subject to the right of appeal as outlined above. "

Though interestingly there no appeal mechanism outlined "above" :-)-O

greetings, el