1) They have foreign connections
(2) They may be Commies
(3) They may be Fascists
(4) They all hate Americans
(5) They'd kill Jews if they thought they could get away with it
And the "posties" still wonder why their circulation is declining. They can't use the old "Free Republic stole our stories" BS anymore and they are at a loss.
I spent a considerable amount of time looking into Mexicans without Borders and its connections, which the Post declined to do, and what I discovered is not pretty. In addition to its clear connections to the “Workers of the World” crowd, among the many interesting things I discovered is that its spokesperson, Nancy Lisle, works out of the Prince William School District. I actually forwarded all that information, which I documented, to Nick Miroff, one of the authors of this article, but he continues to ignore it.