Independent senator Nick Xenophon and Greens senator Rachel Siewert have lent their support to the Greenpeace campaign against unlabelled GM food content, saying they will introduce a joint bill tightening Australia’s food labelling laws. The two senators joined a group of protesting mothers, and Professor Peter Collignon, Director of the Infectious Diseases Unit and Microbiology Department at Canberra Hospital, to denounce the presence of unlabelled genetically modified foods on Australia’s shelves.