In what scenario would law enforcement exercise 'Crowd Intervention'?

The correct choice emphasizes the role of law enforcement in maintaining public order while respecting the rights of individuals to engage in free assembly. "Crowd Intervention" is appropriately exercised when there is the need to address specific unlawful behavior without disrupting the entire event. This approach allows law enforcement to focus on managing and mitigating incidents that could escalate, while still enabling the lawful assembly to proceed, thereby balancing the enforcement of the law with the protection of civil liberties.

In scenarios involving lawful assemblies with no disturbances, crowd intervention would not be necessary, as there is no issue to address. In the context of a well-publicized riot, while intervention is crucial, the focus would be more on control and restoration of order rather than allowing an event to continue. Lastly, dispersing a peaceful protest quickly contradicts the principles of crowd intervention, as it aims to manage issues rather than disrupt lawful gatherings.