closed-door policy
noun [ C ]
ukus COMMERCE
the practice of limiting business with other countries, companies, organizations, etc.:
The government's closed-door policy has made it difficult for foreign countries to import their products here.
the practice of refusing to allow people from other countries to travel in or move to your country:
When Cuba announced it would let anyone leave who wanted to, the US administration reverted to a closed door policy, fearing an immigration tide.
the practice of doing things secretly and not letting the public know about them:
As far as the press is concerned, we are adopting a closed-door policy.