Book excerpt: In 2009 in Australia, a citizens' campaign was launched to silence public criticism of vaccination. This campaign involved an extraordinary variety of techniques to denigrate, harass and censor public vaccine critics. It was unlike anything seen in other scientific controversies, involving everything from alleging beliefs in conspiracy theories to rewriting Wikipedia entries. Vaccination Panic in Australia analyses this campaign from the point of view of free speech. Brian Martin describes the techniques used in the attack, assesses different ways of defending and offers wider perspectives for understanding the struggle. The book will be of interest to readers interested in the vaccination debate and in struggles over free speech and citizen participation in decision-making.