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The Imperial practice of interdiction of worlds within the boundaries of the Imperium had long been a source of contention between liberal and conservative factions in the government. Interdictions must be approved by a member of the Imperial family, but generally such approval is given in response to a request from an interested service, which is almost always the Scouts or the Navy.
It is generally held that the Scouts recommend interdiction to shield a young or sensitive culture from the interference that trade and commerce will bring.
The Navy is held to be more vindictive in its recommendations, for they use interdiction to punish local governments or to hide its own mistakes.
Interdicted worlds are awarded travel zone red ratings by the Travellers' Aid Society.