In the Hound of the Baskervilles, the dog that didn’t bark was the clue that unraveled the mystery.
The pro-immigration hounds are barking at Hazelton, Penn., but not at the Federal government, even though Hazelton just adopted certain Federal immigration laws as city ordinances.
The fact that ACLU and various immigrant LDFs are suing Hazelton but not the Feds (notwithstanding sovereign immunity issues) is further circumstantial evidence that the Feds blow off immigration enforcement.
