Which entity is primarily responsible for investigating allegations of radical behavior in law enforcement?

The Federal Bureau of Investigation (FBI) plays a crucial role in investigating allegations of radical behavior in law enforcement due to its jurisdiction and expertise in handling matters related to domestic terrorism, civil rights violations, and public corruption. The FBI has the skills and resources necessary to conduct thorough investigations that may involve complex issues of radicalization or extremist behavior within law enforcement agencies.

While other entities mentioned may have roles in oversight or conducting investigations, the FBI is specifically equipped to handle cases that involve broader implications for national security and civil rights. Its mandate includes ensuring that law enforcement agencies act within the law and uphold ethical standards, making it the primary agency tasked with addressing radical behavior allegations. This positioning reflects a broader commitment to maintaining the integrity of law enforcement and protecting the public from potential abuse of power or extreme ideologies.