This book will aid understanding and interpretation of the Californian, UK and Australian Modern Slavery Acts, and will provide an in-depth three-way comparative analysis between the three Acts. Modern slavery is a new legal compliance issue, with new legislation enacted in California (Transparency in Supply Chains Act, 2010), the UK (Modern Slavery Act, 2015) and most recently, Australia (Modern Slavery Act, 2018). Such legislation mandates that business of a certain size annually disclose the steps that they are taking to ensure that modern slavery is not occurring in their own operations and supply chains. The legislation applies to businesses wherever incorporated or formed. Key aspects of primary focus will include lessons learned from the California, UK and Australian experience and central arguments on contentious issues, for example: monetary threshold for determining reporting entities, penalties for non-compliance, compliance lists and appointment of an Anti-Slavery Commissioner. The book will also discuss how contentious issues were ultimately resolved and will undertake a comparative analysis of the Californian, UK and Australian Acts. Modern Slavery Legislation will be of interest to academics and students of business and human rights law.