While this opinion piece seemed to create the notion that the FBI caused his demise, no one but Hemmingway knows of the actual incidents that took place to lead him to that belief.

I am sure there were many other incidents occurring in his life that contributed just as much to his early departure.

I can only imagine what it was like back in that era, specializing in a SPECIFIC field with no tangents and suddenly being unable to perform your specialty due to any reason. If anything, this probably lead more to his demise than the FBI.