Big Tech is staffed with hundreds of former Department of Justice employees, some of whom have key insight into government antitrust investigative methods, according to a watchdog’s “revolving door” analysis.

Google, Facebook, Amazon, Apple, Microsoft, and HP have hired at least 360 DOJ employees, mostly since 2011 and in one example dating back to 2000, according to an analysis by the American Accountability Foundation, a conservative watchdog group. The analysis, which also includes information on DOJ employees who used to work for Big Tech, comes amid the department’s antitrust lawsuit against Google and other investigations into tech giants.