What practice is vital for maintaining order during a large demonstration?

Clear communication among units is essential for maintaining order during a large demonstration because it allows for coordinated efforts among law enforcement agencies and personnel on the ground. Effective communication ensures that all units are updated on the situation in real-time, can share intelligence regarding potential conflicts or escalations, and can execute strategies to manage the crowd effectively.

Such communication facilitates the ability to respond promptly to any incidents that may arise and helps to de-escalate situations by providing a unified command structure. When officers in different units are communicating clearly, they can also relay information to protesters, which helps in managing their movements and ensuring safety for all participants. This practice not only contributes to maintaining peace but also enhances accountability and transparency during the operation, fostering trust within the community.

In contrast, options like increasing police presence, prohibiting media, or restricting movement may not necessarily contribute to maintaining order effectively and can even lead to heightened tensions or mistrust between law enforcement and protesters.