written, produced and directed by William Cran ; a Frontline coproduction with InVision Productions, Ltd. in association with BBC-2 ; WGBH Educational Foundation
co-production of The Kirk Documentary Group, Ltd. and WGBH Educational Foundation ; written, produced and directed by Michael Kirk ; produced and reported by Jim Gilmore
a Frontline co-production with Silverbridge Productions Limited ; WGBH Boston ; produced by Greg Barker ; co-produced by Claudia Rizzi ; written and directed by Greg Barker