In Australia, an American peace activist named Scott Parkin, has been detained and is being held in solitary confinement. Australian officials claim he poses a threat to national security. Parkin is best known for organizing protests around the military contractor Halliburton. He has helped lead protests during Halliburton’s shareholders meetings in Texas and worked with Greenpeace on an action during Exxon Mobil’s shareholder meeting in 2003. He was detained Saturday by six federal police and immigration officials as he sat at a cafe in Melbourne where he was teaching at peace activism workshops.