Well, I get your argument for use of the word. And actually looking up "Take by force" a lot of similar words did describe what happened in the slave trade.
Here's the link. <a href="http://legal-dictionary.thefreedictionary.com/take+by+force">take by force</a>
So, once again I was wrong. The word does fit. I tried looking up similar to what you typed but I guess it was to specific and got some "snow" results that didn't help.
Your problem was that you didn't want to hear that particular word, but we ofttimes choose a particular word because of its emotional impact or because it evokes particular overtones. "Slavery" gets your attention better than "Confiscatory".