The chief of the division of markets may suspend or revoke any license whenever, after opportunity for a hearing has been afforded to the licensee, the chief of the division of markets shall determine that such licensee is incompetent or has knowingly or carelessly failed to classify any farm product correctly in accordance with such standards or has violated any provision of this article or of the regulations made under § 39-17-40. Pending investigation the chief of the division of markets may suspend a license temporarily without a hearing.