It wasn't ISAC that was robbed - it was one of the Dundee moms. It was mentioned in (I think) one of the Tico Times articals, written after Dundee was closed.
As far as I know, no one has ever been threatened with physical harm. Unless you count the teens threatened with the program guarantee to readmit them, if they return home and don't continue to work their program.
I do think they have hacked into home computers on occasion - but that is not something anyone has proof of either - as far as I know.