Amazon is taking four companies that have deliberately accused of filling their shopping mall with fake updates.
Three firms have nearly 350,000 reviewers in their books.
The companies act as illegal traders between Amazon retailers and people who write reviews, says the technology giant.
Reviewers receive free products and a small fee as a refund for each review. And the company charges the seller a fee to increase its rates on Amazon.
Marketers are unaware that this is done using fake reviews, says Amazon.
Firms threatening legal action are accused of jointly identifying their forums in the US, UK, Europe, Japan and Canada. It looked at three of them earlier this year, and now it faces another.
Man has stopped trading because of that. In a letter on its website, Matonex said it was “completely shut down” following Amazon’s action.

On the website of one of the firms still operating the business. There is advice for customers to have their reviews rejected by Amazon.
Possible causes include
trying to leave a review before the delivery date
meaning that the product is free or discounted
ordering the same product several times “from the same location and computer”.
“Please write your reviews honestly and not too often,” he adds.
Amazon says that as part of its solution, one company has agreed to share details of who its customers are. He says this will help him track them down.
He acknowledged that it would be difficult to see it because the exchange does not happen on Amazon itself.
The review has a huge impact on online shopping decisions. The UK government says the average family spends £ 900 a year. On products based on what others say about it.
New proposals
Under the new proposals currently under consideration in the UK. It would be illegal to pay someone to write or hold false reviews.
A recent survey conducted by a consumer watchdog What? found that nine of the top 10 headphones in Amazon earlier. This year had brilliant updates to the unrelated product list.
Which one? said it welcomes Amazon’s actions.
“However, our latest research has found that there are still unscrupulous businesses using vulnerabilities. With the Amazon review system, which leaves consumers at risk of buying products raised by thousands of five-star false reviews,” said Rocio Concha, director of policy and advocacy.
“The Competition and Markets Authority’s ongoing investigation into false reviews.
