Two incidents in the early 1990s brought criticism to the agency, the Branch Davidian raid in Waco, Texas, and the incident at Ruby Ridge. In both cases, the FBI later took over what began as BATF operations.
The Bureau of Alcohol, Tobacco, and Firearms (BATF or ATF) was renamed the Bureau of Alcohol, Tobacco, Firearms and Explosives and was moved into the Justice Department from the Treasury Department, and is reponsible for the law enforcement effort.
BATF operates under the rationale of requiring you to comply with the law.
I required this of BATF as a federal prosecutor for almost 30 years, and I require it as a private citizen and as a lawyer.
If a BATF special agent, a firearms specialist from BATF's Technology Branch in Washington (part of the criminal enforcement branch), or other criminal law enforcement type is present, this is not an ordinary compliance inspection and you should immediately terminate it, direct the individuals to leave and contact legal counsel.