Seller beware — if you buy reviews for your products on Amazon, the company might sue you.

As part of its effort to combat fake reviews on its platform, Amazon sued three of its sellers today for using sock puppet accounts to post fake reviews about their products. Amazon has been aggressively pursuing reviewers it does not consider genuine over the last year, often using lawsuits to discourage the buying and selling of reviews, but this is the first time it has sued the sellers themselves.