The Minutemen are on TV almost every night...they are in the desert Southwest...and they aren't hiding...
So, why is it any surprise to anyone that the Mexican Government would know where they are??
The US Govt doesn't have to tell them...and they don't.
That's funny, because I live in California a state flooded with illegal immigrants, read Freerepublic, a site obsessed with illegal immigration, and the Daily Bulletin is my local paper, and I still haven't a clue exactly whose property the Minutemen are oprerating on, where, and how many members are are involved. It seems like they take some pains for whatever reason to keep those details to themselves.