Dear Hungry for Life,
Many suggestions have already been given here, My thoughts are do the simplest, the least disturbing thing, the one that shows the most love to all, and takes the least amount of effort.
Down through the centuries whenever a man abuses a women, others stand up and protect her. All that is needed is that the husband. the elders and perhaps the Society itself needs their chains rattled a little. Just let them know that they are being watched, let them know that any harassment, abuse, verbal or physical is being monitored and recorded. I would love for you to post the name of the congregation here, but that may not be possible, but all you have to do is find someone in the congregation, probably just some insignificant sister and let her know what is going on. The grape vine will do the rest.
When some is marked in the congregation, no announcement is made, it just spreads from mouth to mouth, in secret. What I am suggesting here is just reverse the process.
My thoughts are with you and your friend, and there are more with us than with them.
belbab