Section 11

If any person knowingly harbours any person whom he knows, or has reasonable grounds for supposing, to be a person who is about to commit or who has committed an offence against this Act, or knowingly permits to meet or assemble in any premises in his occupation or under his control any such persons, or if any person having harboured any such person or permitted any such persons to meet or assemble in any premises in his occupation or under his control, wilfully omits or refuses to disclose to a police officer any information which it is in his power to give in relation to any such person, he is guilty of an offence against this Act.

In this section, “harbour” includes supplying a person with shelter, food, drink, money, clothes, arms, ammunition or means of conveyance, or assisting a person in any way to commit an offence against this Act.