Ignoring the many other reasons why that would be problematic, what happens when the US government suddenly owns notable (or even controlling) stakes in companies?
>>jmb99+(OP)
You would effectively have corruption. Governments would be more reluctant to take actions which could be negative when they have direct ownership vs their normal "indirect ownership" via taxation.
>>x-comp+d41
I'd love to see a list of pros. There are no pros. It's effectively death to competitors and actually extremely damaging to the companies themselves as well.