According to stories in the the LA Times and the Associated Press on at least two occasions US forces have held the wives of suspected insurgents in an attempt to get the husbands to surrender.
In one case, a secretive task force locked up the young mother of a nursing baby, a U.S. intelligence officer reported. In the case of a second detainee, one American colonel suggested to another that they catch her husband by tacking a note to the family's door telling him "to come get his wife."
In thinking about these Mafia-style tactics I think it is important to remember that the current justification for our forces being in Iraq, now that it is clear that Iraq was not any sort of threat to the US, is that we are bringing freedom and democracy to Iraq so that it can be a shining example to the rest of the region and the world. What lesson are we teaching by these tactics?