Later, in response to a request on the forum for access to “Chinese accounts” from someone using the alias “Wuhan,” Golem responded with a link to the profile information of 100,000 Chinese customers, according to the lawsuit. Golem said he had a total of 350,000 profile records of Chinese customers and offered to release the rest of them if there was interest, the lawsuit says.
On Oct. 17, Golem returned to the forum to say he had data about “wealthy families serving Zionism” that he was offering for sale in the aftermath of the deadly explosion at Al-Ahli Arab Hospital in Gaza City, the suit said. Israeli officials and Palestinian militants blamed each other for the explosion, but Israeli and American intelligence agencies contend that it was caused by a failed Palestinian rocket launch.
The plaintiffs are seeking a jury trial and unspecified compensatory, punitive and other damages.
“The current geopolitical and social climate,” the lawsuit argued, “amplifies the risks” to users whose data was exposed. Representative Josh Gottheimer, Democrat of New Jersey, called for an F.B.I. investigation into the breach earlier this month, noting the focus on Ashkenazi Jews.
“The leaked data could empower Hamas, their supporters, and various international extremist groups to target the American Jewish population and their families,” Mr. Gottheimer wrote in a letter to Christopher Wray, the F.B.I. director.
Ramesh Srinivasan, a professor in the department of information studies at the University of California, Los Angeles, said it was inevitable that these types of breaches would continue.