[Sorry, no link; there are plenty of sites advertising these services but I can’t find any mews stories at CNN or anywhere else.]
Immigrants are taking classes in order to learn to speak English with less of an accent. The point, according to the guest who runs such classes, is to make themselves more easily understood and improve their employment prospects.
The interview of the above-mentioned guest referred heavily to that first choice, but was pretty fair. They gave him plenty of time to respond.
UPDATE: Apparently Pollcode.com sucks. It worked at Blogspot.