Visa Inc V 0.18% announced on Wednesday that it will join with rivals MasterCard Inc MA 0.3% and American Express Company AXP 0.79% in taking a stand against the underground U.S. sex trafficking industry by blacklisting classified advertising site Backpage.com.

According to law enforcement officials, the site is at the center of a sex-trafficking industry that preys on young and vulnerable women.

The Accusations

According to Chicago-area Cook County Sheriff Thomas Dart, sex traffickers use the “adult” section of Backpage and similar classified sites to post ads for illegal prostitutes that advertise their services as “escorts.” Dart recently asked both Visa and MasterCard to join American Express in no longer providing service to Backpage’s adult section.

Taking Action

After MasterCard agreed…

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