Does the law define criteria by which gatekeeper companies are identified, or does it explicitly call out six companies for scrutiny? In the US, in general, th

Does the law define criteria by which gatekeeper companies are identified, or does it explicitly call out six companies for scrutiny? In the US, in general, that kind of targeted law is highly frowned upon (bills of attainder were a tool the King used to target political opponents and the Constitution wrote them out as a result).