What significant law enforcement organization was formed in Massachusetts in 1865?

The significant law enforcement organization that was formed in Massachusetts in 1865 is indeed the State Investigative Agency. This agency was established to address the need for coordinated efforts in law enforcement and to provide investigative services at a state level, reflecting the growing complexity of crime and the need for specialized investigative techniques during that era.

The formation of the State Investigative Agency marked a pivotal moment in Massachusetts law enforcement history, as it laid the groundwork for structured law enforcement operations beyond local jurisdictions. This organization was instrumental in pioneering investigative methods and contributing to the professionalization of police work in the United States. The establishment of such agencies was crucial during a time when crime was becoming more organized, and the resources of local law enforcement were often inadequate to tackle more significant criminal cases.

The other options, while potentially related to aspects of law enforcement or public safety, do not specifically reference the key organization established in Massachusetts at that time, making them less relevant in the context of the given question.