WIRED News has an article on
the Kafkaesque world of US "terrorist watch lists". If your name (or some approximation thereof; which is why it can suck to have a common Arabic name) appears on them, you can be detained for interrogation should you attempt to board a flight in the US, or denied credit. You are not entitled to any explanation and have no right to recourse, and the very existence of some of these watchlists, or how many there are, is not officially acknowledged. Which, as you can imagine, lends itself to abuse:
Despite that, last month constitutional scholar Walter F. Murphy, McCormick Professor of Jurisprudence Emeritus at Princeton University, found himself unable to check in curbside at a New Mexico airport. A check-in clerk with American Airlines told him it was because he was on a "terrorist watch list," Murphy says.
"One of them, I don't remember which one, asked me, 'Have you been in any peace marches? We ban a lot of people from flying for that,'" recalls Murphy. "I said, 'No, but I did give a speech criticizing George Bush,' and he said, 'That will do it.'"
While there are almost no American citizens on the OFAC list, it is routinely used during home purchases, credit checks and even apartment rentals, and has caused people with common Latino and Muslim names to be denied mortgages for having a name that only vaguely resembles a name on the list, according to a recent report (.pdf) from the Lawyers' Committee for Civil Rights.