Scott Bloch is due to be sentenced on May 13, 2013. The court may accept victim impact statements, but they must not contain information about third parties (this is likely what caused many statements to be taken off the docket two years ago). One statement is already on the docket. As you can see, it can take the form of a letter.
You have less than two months. If you don’t speak up now, you can’t complain if he walks away with a slap on the wrist. Tell the court how you feel, in your own voice. No NGO can do it for you.