CHICAGO — Backpage.com, the classified listings website, filed a lawsuit Tuesday against the Cook County Sheriff, who recently persuaded several credit card companies to stop offering their payment services on the site.

MasterCard Inc., American Express Inc. and Visa Inc. said that they would stop processing ad sales on the "adult" section of the site, heeding a call from Sheriff Thomas Dart, who alleged in a letter to the companies that the website's adult section helps fuel the illegal sex industry.

In the suit, filed in federal district court in Chicago, Backpage says the sheriff, in using his legal authority to persuade the card companies to discontinue their dealings with the website, violated the free speech rights of individuals who use the service to post ads.

The filing asks the court also to award Backpage damages making up for lost revenue and goodwill resulting from the lost business.

"Sheriff Dart's actions to cripple Backpage.com and all speech through the site are an especially pernicious form of prior restraint," the suit said. "He has achieved his purpose through false accusations, innuendo, and coercion."

Liz McDougall, general council to Backpage.com LLC, said, "Our goal is to ensure that one elected official, particularly a county sheriff, cannot dictate what speech is or is not appropriate."

Mr. Dart's office acknowledged that Backpage's business model is protected by the law, because Backpage isn't responsible for the content posted on its website. But Ben Breit, a spokesman for the Sheriff's office, said the sheriff requested that the credit card companies voluntarily discontinue their relationships with Backpage "in the name of good corporate citizenship."

"It is regrettable that Backpage has dedicated so many resources to lawyers and lobbyists when they could be partnering with law-enforcement to seek justice for sex trafficking victims," a statement from the sheriff's office read.

Payment card networks are just the latest in a long series of battles between the listings site and public officials. In 2012, public pressure helped prompt Village Voice Media holdings LLC to spin off Backpage from its portfolio of media entities including Village Voice and LA Weekly. Earlier this month, the Attorney General of Massachusetts urged Backpage to remove its adult section after two men allegedly killed an escort they found through a listing on the website.

"Most of the human trafficking cases that our office has prosecuted specifically involve advertisements on Backpage," a statement from Attorney General Maura Healey's office said.

But the website has overwhelmingly prevailed in legal challenges, with federal courts repeatedly stating that the ads it hosts are protected speech.

Mr. Dart's approach of limiting the website's operation through credit-card companies also represents a departure from his own past efforts. In 2009, the Sheriff filed suit against Craigslist, saying that the website's erotic services section facilitated prostitution and was therefore a public nuisance.

Mr. Dart lost that case on First Amendment grounds. One year later, Craigslist closed its adult section, responding in part to public pressure.

Write to Michelle Hackman at Michelle.Hackman@wsj.com

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