During the Hoover days, he refused to even acknowledge the existence of organize crime...
When at Fort Belvoir, in 1967 or 1968, a few of us took the FBI tour. I asked the agent giving the tour about that. He clearly didn't like it but said something about something being worked on.
The best part of the tour was an agent demonstrating the Thompson subgun. They didn't use that anymore but the public liked that demo. The agent was an older, big guy who leaned in a bit and got an amazingly good shot group in auto fire.