This morning's Supreme Court decision in Blanche v. Lau is probably the least of the three immigration cases that remained on the Court's docket, but touches on a large issue: how hard the law makes it to remove criminal aliens from the country. Justice Clarence Thomas wrote the opinion for a 6–3 majority (four of this morning's five decisions were 6–3 along the familiar ideological divide). The Court struck a blow in favor of the immigration authorities in denying entry to green-card holders where they have committed crimes but have not yet been convicted. Once convicted, if they are still here, ...