 Part III prohibits strikes and lock-outs in the electricity, gas and water service industries.It also renders illegal such actions taken in respect of other essential services unless 14 days' notice has been given, or during the course of proceedings taken to resolve trade disputes.Part IV contains various general provisions, including provisions empowering the police to disperse assemblies; carry out searches; and take photographs, finger impressions and body samples from persons arrested, detained or subject to police supervision.