It is sad, harrowing and lacking in backbone that a Society does not stand by its employees. And not being told is plain unheard of!
What a shame ... (is all I can utter for the moment).
I hope you Society members can call those responsible for the whole conduct of the investigation to come to account, both for the Society and some very trusted/talented senior execs. Besides, I hope you will find the wisdom how to move forward and perhaps have a change of Board.