And if you want to threaten someone with "resign or I publish", you do it privately.
Maybe I do not appreciate human ego, but it is difficult for me to imagine that TBI could really expect that the directors from TBF he singled out would just resign from TBF upon publication of his blog post.
And the problem with confronting them privately is that probably he does not know them and they would likely ignore his threatening emails.
anyway, it looks said and not a way to go. He could make his portfolio known to respected members of the community and ask them to take action.
If there are any damaging documents at all ...