Paul Le Blanc is Professor of History at La Roche College (USA) and author of internationally acclaimed works on the labour and socialist movements, including Lenin and the Revolutionary Party, From Marx to Gramsci, and Leon Trotsky. An editor of the eight-volume International Encyclopedia of Revolution and Protest, he is currently helping to oversee the Verso Books edition of The Complete Works of Rosa Luxemburg. David Mandel is a Canadian scholar, union and political activist. He teaches political science at the Université du Québec à Montréal and has been active in labour education in the Russia, Ukraine and Belarus for many years. He has written extensively on the labour movement in the Russian Revolution and also in the post-Soviet period, including The Petrograd Workers in the Russian Revolution - February 1917-June 1918 (a revised and enlarged edition to appear in 2017, Brill and Haymarket Press) and Labour after Communism (Black Rose Press).