Not about illegal immigrants but about an English emmigration to Australia and the difficulties of returning "home", I think "The Exile", by the late Alan Burbidge is a great song although when I sing it I change the last verse a little,specifically the two lines beginning, "And it gives you such a fright....." to "And the streets are full of drunkards, the litter lies in heaps,And the lager louts and Thatchers lot have put the land to sack".
I got the song from Alans widow at Whitby Week a couple of years ago when I was looking for songs a little different from the usual Irish and Scottish songsfor an immigration gig.Ive lost her address but you can get the Alan Burbidge Song Book from Tom Brown, Daylight Press,Trafalger House,Castle Sheet, Coombe Martin, North Devon,EX340JD