Some databases contain contentious topics that are prone to repeated contradictory edits (an ‘edit war’), or contain localised topics of interest that lend themselves to focused attention. The contributor in question will have ignored Warning Messages to stop disruptive or improper activities.
You can ban a contributor from a certain topic and its related children topics. The ban can be permanent or temporary. If it is temporary, there needs to be a way to reverse it.
A related sanction might be to reverse a contributors previous contributions to the topic.
Banning contributors is not trivial, it should be done in accordance with the Published Policies. Whatever the decision, it is vital to notify the contributor to inform them of the actions you are taking