The U.S. Supreme Court has struck down a federal law making it a crime to lie about having received the Medal of Honor and other prized military awards. The court voted 6-3 Thursday in favor of Xavier Alvarez, a former local elected official in California who falsely claimed he was a decorated war veteran. Alvarez had pleaded guilty to violating a 2006 law that was adopted with the U.S. at war in Afghanistan and Iraq and aimed at people making phony claims of heroism in…