If not the CIA, then maybe the FBI? How about both? Philip Mudd worked for both agencies and then resigned and he has the answers. Including whether RFK Jr.'s suspicions about Operation Mockingbird are valid.

Did the CIA Poison the World’s Best Goalkeeper at the 1970 World Cup? (with Gabriel Gatehouse) - Part 1
35:50

Inside the Kremlin's Playbook: How Russia Really Works (with Michael Carpenter)
44:49

What the CIA Knows About Iran That Washington Keeps Getting Wrong (with Mark Fowler)
52:00