from an article about the Amber Alert system for child abductions:

>There's an ancient common law principle called "hue and cry.'' When you see someone commit a crime, you're supposed to raise a hue and cry -- "Stop, thief!'' -- so bystanders will pursue the wrongdoer.<

Evidently the word hue has a different, and assumingly obsolete, semantic in the context of this old expression...what is it?

And is anyone familiar with the expression "hue and cry" itself?