Amazon is going on the offensive against fake reviews, filing a lawsuit against more than 1,000 people who allegedly asked for money to post about products.

The online marketplace is suing people who had been offering on Fiverr.com, a website that lets people do tasks for as little as $5, to write and post fake reviews. Amazon did not include the website in the complaint, choosing instead to go after the people writing the reviews. The lawsuit claims that a group of anonymous people — termed as "John Does" in the filing — have been offering to write five-star reviews for products in return for payment.

Amazon's review section is among its most important features, offering users the ability to comb through positive, negative and lukewarm feedback on the items. The company has been working on other ways to improve the quality of its reviews, recently revamping its system to give more weight to reviews of people who bought the product through Amazon.

This lawsuit follows a similar action filed in April against the owners of a group websites that offered to write Amazon reviews, including buyamazonreviews.com, bayreviews.net, and buyreviewsnow.com.

"While small in number, these reviews threaten to undermine the trust that customers, and the vast majority of sellers and manufacturers, place in Amazon, thereby tarnishing Amazon’s brand," Amazon claimed in that case.

Amazon provided examples of the posts offering fake reviews.

Amazon alleged that one reviewer manipulated the system in order to post "verified reviews," considered the most trusted on the platform,

"In at least one instance, the seller of a 'Verified Review'... was willing to receive an empty envelope, not the product itself, simply to create a shipping record in an attempt to deceive Amazon and its customers," Amazon claimed in its lawsuit.