Campaign for the Accountability of American Bases
The United States has around 6,000 military bases on its own soil and more than 1,000 worldwide. The Campaign for the Accountability of American Bases is a British organization that asks questions about U.S. bases in the UK and worldwide. Their website is worth a look. If we're going to have states, I'd rather we have national sovereignty in a world of nation-states than imperialism under any guise, not least humanitarian intervention, so it would be a good thing if the UK would kick 'em out. Fat chance, I know, but there's no harm hoping.