There was a good piece on these guys (and gals) on one of the Outdoor Channel's Wensday Night at the Range shows last year which might be floating around on youtube, Hulu or somewhere if you look.
Last year I saw something on the Discovery Channel about Thompsons that mentioned a show in Newark. Here is a link to some info;
http://www.machinegunboards.com/forums/index.php?showtopic=13176
They have the show & shoot every year but you have to join their organization ($30) to attend.