re: Why?
Same reason the FBI investigated John Kerry.
Any kind of radical might attract the attention of FBI.
And radicals tend to attract the criminal element and all sorts of loons- like shit attracts flies.
I imagine that anyone who is at all famous and controversial will have a substantial FBI file.
For example, I bet Mel Gibson with his Movie "The Passion" has drawn a considerable amount of FBI interest.
And these people are also going to be calling the cops or FBI frequently in order to get rid of the "more persistent" undesirables.
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