What was the name of the secret unit established that remained undisclosed for 35 years?

The chosen option reflects a significant historical element in law enforcement practices. The "Secret Investigative Unit" is emblematic of the types of covert operations that may have been conducted by law enforcement agencies without public knowledge or oversight. Such units are often designed to handle sensitive investigations, operate under strict confidentiality, and execute strategies that are not made public to protect ongoing operations or the safety of individuals involved.

The extended period of 35 years without disclosure indicates the seriousness and potential controversies involved in these operations, highlighting issues of accountability and transparency in law enforcement. This lack of disclosure can raise questions about oversight and implications for civil rights, making it a critical aspect of discussions around law enforcement's use of secretive investigative methods.

In contrast, other alternatives such as "Special Operations Team," "Criminal Intelligence Committee," and "Undercover Division" might represent various special units within law enforcement but do not necessarily carry the same connotation of prolonged secrecy or undisclosed operations over several decades, which is the defining characteristic of the Secret Investigative Unit. Each of these other options could be valid components of policing structure but do not encapsulate the specific historical context described in the question.