Challenging entrenched biases, the work emphasises the decolonisation of radicalisation theory, integrating critical perspectives from social movement theory to postcolonial studies. It uniquely proposes a 'bottom-up' approach to policy and intervention, emphasising grassroots initiatives. Featuring contemporary global case studies from both the Global North and South, this book provides essential, innovative insights for academics, policymakers, and practitioners. It explores complex issues such as reciprocal radicalisation and cumulative extremism, urging a more nuanced understanding to address this pressing global issue effectively.