Peter Schey of the Center for Human Rights and Constitutional Law - someone with a series of links to the Mexican government - has now joined with the League of United Latin American Citizens in a lawsuit against Arizona over their new immigration law (link):

The complaint, filed Friday in federal court in Phoenix as a class action, alleges that Arizona's training materials recently developed and distributed to Arizona law enforcement agencies to implement the law "exacerbate the conflicts between the United States Constitution and federal laws on the one hand, and Arizona law on the other hand."

"The training materials issued a few days ago by Arizona are so vague and ill-defined that they will certainly lead to widespread racial profiling and discrimination," said Peter Schey, president of the Center for Human Rights and Constitutional Law.

..."As the oldest and largest Hispanic civil rights organization in the United States, we are profoundly disturbed by the anti-immigrant law recently enacted in Arizona," said LULAC National President Rosa Rosales. "We plan to vigorously fight that law, and Arizona's discriminatory training materials to implement the law, in the federal courts, in the Arizona legislature, and in the United States Congress."