Muslims who want to live under the Islamic Sharia law were told Wednesday to get out of Australia as the government targeted radicals in a bid to head off potential terror attacks. A day after a group of mainstream Muslim leaders pledged loyalty to Australia at a special meeting with Prime Minister John Howard, he and his ministers made it clear that extremists would face a crackdown. Treasurer Peter Costello, seen as heir apparent to Howard, hinted that some radical clerics could be asked to leave the country if they did not accept that Australia was a secular state and...