Prior to the Patriot act the CIA and the US Military were not allowed to share intelligence with the FBI or any other US Agencies. The reason being that the CIA and Military were concerned with intelligence and criminal activity outside of the US while the FBI et al., was res;onsible for activity inside the US. Some of the limitations that protect citizens from illegal search and seizure by US Agencies are not limitations of the CIA and/or the US Military. For that reason to ensure that cases were not tainted, and to help prevent the disclosure of US Intelligence assets and techniques, the agencies were not allowed to share information. This developed into a culture where all agencies tried to limit or refuse to share information even those that were allowed to like the ATF, FBI, and DEA.