What represents about 270,000 of the 600,000 active police officers in the United States?

The Fraternal Order of Police is the largest police organization in the United States, representing a significant number of active police officers. With approximately 270,000 members, it serves as a national voice for law enforcement officers and advocates for their interests and welfare. This organization focuses on issues such as labor rights, benefits, and professional development for its members.

In the context of the question, selecting the Fraternal Order of Police correctly reflects its substantial representation among active police officers in the country. This membership base indicates the organization's influence and role in supporting law enforcement personnel, making it a vital entity in the realm of policing. The other entities listed do not represent the same level of active officer membership or influence within law enforcement, thereby distinguishing the Fraternal Order of Police as the most fitting choice.