WASHINGTON (Reuters) - U.S. agents have raided the homes of five people who allegedly traded hundreds of thousands of songs, movies and other copyrighted material over the Internet, Attorney General John Ashcroft says. Agents raided residences in Texas, New York and Wisconsin early on Wednesday and seized computers that they suspect were involved in a nationwide file-trading network. The raids marked a sharp escalation of the years-long legal battle surrounding unauthorised copying over peer-to-peer, or P2P, networks. Until now, the Justice Department has only pursued elite groups of hackers who steal and distribute movies, music and software before their official...