"former Apple CEO Steve Jobs, former Google CEO Eric Schmidt and top executives from [Intuit, Pixar and Lucasfilm] had reached "no-poaching" pacts prohibiting each other from trying to lure away each other's top workers with offers of higher-paying jobs."

These were the ones for whom DoJ had enough "smoking gun" proof, but Jobs and Schmidt had a lot of friends elsewhere (Larry Ellison...), so the cartel was likely much bigger.