An individual is called to account before the group, witnesses denounce the person, the offender is pronounced guilty, and the offender is then stripped of the identity of being a group member. example of labeling theory degradation ceremony example of differential association theory illegal type of self-control

This is an example of degradation ceremony.
The group has gathered to decide what they want to do with the individual. They decide that he or she is not worthy of being a member anymore, which means that they are degrading his rank within the group (or in this case, expelling him or her). 
The term was coined by sociologist Harold Garfinkel in 1956 in his essay "Conditions of Successful Degradation Ceremonies."