Organized crime and terrorist networks are major threats for the European Union and its societies. First-line-practitioners such as teachers, social workers, youth worker, (mental) health care workers and community police officers are key players in early prevention and identification of radicalisation, terrorist activities and crime. Therefore, the platform firstlinepractitioners.com provides latest information and knowledge, practical guidelines and useful supporting tools for first-line-practitioners and the public in order to facilitate collaborative activities against radicalization, terrorism and organized crime.