Margrethe Vestager and the European Commission have had a busy few months.
"Dominant companies have a responsibility," Vestager said earlier this year.
In April, Vestager, the EU's Antitrust Chief, formally accused Google of abusing its dominance as as as a search engine. Now, Vestager has set her sights on another one of America's most dominant tech companies and one of its most popular services.
"Let me tell you a story about a book that keeps getting better," said someone in a promotional video for Amazon Kindle.
Amazon has dominated the e-books market for years, and according to the EU, CEO Jeff Bezos and company could be using that dominance get publishers to agree to deals that are unfair for the potential e-book competition.
The EU says it wants to investigate certain clauses in book publishers' contracts that supposedly inform Amazon about "more favorable or alternative terms offered to Amazon's competitors and/or offer Amazon similar terms."
If true, Amazon could ensure it gets the best deal because it would know about deals given to other companies.
And while we don't know if these allegations are true, we do know Amazon has no problem playing hardball with book publishers and swinging its e-book weight around. (Video via PBS / "Charlie Rose")
"Amazon, in attacking authors, has created a religious war. Writers are religious about books," author James Patterson told Bloomberg.
Throughout 2014, Amazon had several messy battles with book publishers over e-book prices while renegotiating contracts. Hachette Book Group and HarperCollins Publishers both felt the wrath of the nation's largest e-book publisher when Amazon was accused of delaying shipments, getting rid of pre-order options online and raising prices.
According to Codex Group, Amazon accounted for six out of every 10 e-book sales in March 2014.
Notably, the European Commission hasn't yet formally charged Amazon. As it stands, the commission is only conducting an investigation into the American tech giant.
This video includes images from Getty Images.