Being stopped that late is a bit different than the US AFAIK, but there is certainly the possibility of being stopped from work and (depending how you react) prevented from leaving the US for purely economic inventions:

https://en.wikipedia.org/wiki/Invention_Secrecy_Act

I find it notable that the US' actual checks on government have worked against expanding the secrecy act further into economic protectionism for favored industries, etc.