I think the Bounty campaign Manager would be more pleased and a good reference for them if you include evidence that the Alt is in violation and involve the Alt account in their campaign.

Indeed, the rules written here, many accounts may not be an issue, it's different if the Alt violates the written rules, I think if the OP posts some more evidence, like: they cheated in the campaign, it will be more appreciated and don't forget to inform the manager concerned to be made their reference in future campaigns.