The 2018 cyberattack on the Marriott hotel chain that collected personal details of roughly 500million guests is now known to be a part of a Chinese intelligence-gathering effort that also hacked health insurers and the security clearance files of millions more Americans. The hackers are suspected of working on behalf of the Ministry of State Security, the country's Communist-controlled civilian spy agency. Initially, Marriott admitted that 500million customer's personal information had been exposed. It later amended their admission to "less than 383million" customers, and claimed many of the customer's payment cards had expired.