This volume contains the contributions of the 21st Cross-Border Crime Colloquium webinar hosted by the Norwegian Police University College, Kongsvinger and organised 22-24 August 2021. Despite the pandemic, the Colloquium Group decided to return to the ‘criminal normal’ and the related research on (cross-border) organised crime, corruption, labour exploitation, fraud, ecological crime and the search for criminal revenues. These are partly old themes, some getting renewed attention, such a...