Suppose three users A,B, and C, enter Academia.SE in collaboration with moderate knowledge. Each one would vote the post of the other. That is, each would be able to get at least two votes for each of their questions and answers due to the other two collaborators. This would make A, B, and C gain reputation and privilege immediately over a short period of time. As SE does not show who voted the posts openly, it would be difficult for this plot to get detected by the peers of the site.
Is this even possible? Or would such unethical accumulation be detected by the system and intimate the higher moderators?
The reason I post this question to Academia.SE-Meta and not SE-Meta itself is that this act would be easily taken care of in solid Q&A sites like StackExchange.SE and ServerFault.SE; the number of downvotes would counter-balance the number of unethical up-votes. Whereas Academia.SE is where there is not always a solid answer for a given question. It would be easier for A,B and C to slip away with mediocre Q and A due to the illusive nature.
Is there already a way to prevent this? If not, what could be done?