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We have updated our Community Code of Conduct. Please read through the new rules for the forum that are an integral part of Paradox Interactive’s User Agreement.
You could ask that they be banned from the thread. That would need pretty strong evidence of misbehaviour though.
To answer the question; no you cannot stop people from taking part or telling them not to.
You could post in a subforum of a game that they have not registered and where the forum requires registration to be able to post...
