The National Association of Boards of Pharmacy was hit with a lawsuit alleging a conspiracy backed by the drug industry “to choke off” online information about importing affordable medications from abroad.

The NABP leads a “network of overlapping” nonprofit organizations that have persuaded search engines, social media companies, shippers, and payment processors to adopt “shadow regulations” effectively restricting online searches to domestic pharmacies, according to the complaint filed by PharmacyChecker.com LLC.

The organizations have “euphemistic” pro-consumer names, but they’re allegedly doing the bidding of large pharmaceutical companies that want to keep drug prices high by preventing competition with cheaper imports...