My JW girlfriend pointed to this issue. She said see the Holocaust Museum. JW's were persecuted by the Nazi. Yes, many people of ALL faith's were arrested for one thing or another.
The JW were arrested for being subversive to the Nazi plans. They were conscientious objectors and refused to support the Nazi. Unfortunately about 1,500 died under poor detention conditions. Only 250 JW were actually executed. Arrested JW prisoners were offered a half page letter to sign promising their support of the Nazi - and they could leave. Go home. Flee the country what ever. (The argument being just sign their letter and leave. God would know what is really in your heart. Just sign it and leave - live.)
I really pales in comparison to 6,000,000+ Jews who never had a chance and were executed just because they were Jews. There would have been many many more if we didn't intervene.
A plaque is nice. How about 6,000,000 more for those that never had a chance.