Don't get me wrong - I think this stinks to high hell also, but the way I read this article, Alabama law gives them the legal authority to subpoena people and make it stick. I'm not an Alabama attorney, so I can't say for sure, but that's certainly how it sounds to me...
A panel consisting of five members from Alabama's Democratic Executive Committee has been formed with full subpoena power.
There are LOTS of archaic laws hanging around. They go away when they are challenged. It's as easy as that.
There is NO WAY a political party has subpoena power under the United States Constitution--which doesn't even RECOGNIZE political parties.
Show me the Constitutional basis for a kangaroo court formed by a partisan political machine, please.
All this would take is someone like Judicial Watch to get interested in it--unfortunately, they're too busy tilting at windmills just now.
Maybe Landmark. Whomever, all it would take is a serious legal challenge and that "law" would be a dead letter.