As much as it pains me, I have to agree with
@623STEWARD
....that letter, while an accurate depiction of events to date, serves no purpose other than political posturing.
I don't see any way that it is a "spring board" for any meaningful future actions.
Instead of writing to Hoffa again, why not file some charges, with somebody, somewhere.
Here's an idea, get an interview on Meet The Press, Frontline, or 60 Minutes?
These letters seem a bit redundant at this point.