Fabien Escalona is Research Associate at Sciences Po Grenoble, France, and journalist of the French online journal Mediapart. His publications include La reconversion partisane de la social-démocratie européenne (2018), European social democracy during the global economic crisis (co-edited with D. J. Bailey et al, 2014), and The Palgrave Handbook of Social Democracy in the European Union (co-edited, 2013).

Daniel Keith is Senior Lecturer in Politics at the University of York, UK. His research interests include radical left politics, populist parties and internal party organisation. He has recently published research on political parties in journals including the European Journal of Political Research, West European Politics and Party Politics. He has also coedited the volumes Europe's Radical Left from Marginality to Mainstream (edited, 2016) and the Routledge Handbook of Political Parties (forthcoming).

Luke March is Professor of Post-Soviet and Comparative Politics, University of Edinburgh, UK. Key publications include The Communist Party in Post-Soviet Russia (2002), Radical Left Parties in Europe (2011), Europe's Radical Left: From Marginality to the Mainstream (edited, 2016) and The European Left Party (with R. Dunphy 2019).

Aims to promote critical reflection on the way we conceptualise and study the radical left

Brings together a range of leading analysts to provide a definitive compendium

Makes an essential starting place for those interested in all aspects of the radical left