That can be enforced by what's called "EXIT VISA!"
An exit visa renders your passport meaningless and will prevent you from traveling until you satisfy certain conditions and obtain (pay fees to boot) permits and approval stamps from a number of departments that may take months if successful.
Going to the airport and boarding a plane to travel abroad would be a thing of the past because without those approvals the TSA/airline employees will throw you out of the airport.
We'd better get the bastards out of power on Nov. 6.
” An exit visa renders your passport meaningless and will prevent you from traveling until you satisfy certain conditions and obtain (pay fees to boot) permits and approval stamps from a number of departments that may take months if successful.”
This will hurt trade to no end.