Backpage.com was once one of the most popular classified advertising websites online. According to Wikipedia, “Backpage let users post ads to categories such as personals, automotive, rentals, jobs and adult services. It soon became the second largest online classified site in the United States.” It was also apparently a hub for illicit activities.
In 2018, the US Department of Justice seized the website and Backpage.com domain name. At that time, the USDOJ issued a press release announcing the domain name seizure with a link to the indictment. A screenshot of the landing page from Screenshots.com can be seen below with law enforcement seals and seizure notification: