Trotsky's 'ABC of Materialist Dialectics' is a brilliant short explanation of Marxist philosophy. It was written as part of a defence of Marxism against a middle class revisionist tendency in the American Trotskyist movement in the late 1930s, which attempted to challenge its basic principles. As opposed to pragmatism and empiricism, Trotsky defended dialectical materialism as a richer, fuller, more comprehensive view of society and life in general. Originally published 8 December 1939.

We republish Leon Trotsky's 1938 pamphlet, Their Morals and Ours. Written while Trotsky was in exile in Mexico, the pamphlet answers critics of the Russian Revolution, who smeared the Bolsheviks as "amoral". Trotsky argues that morality is not fixed but reflects class interests in society. So-called common sense and "elementary moral precepts" against violence, for example, in reality serve the interests of the ruling class. Revolutionary morality – including the use of violence in class struggle – is determined by whatever advances the cause of the proletariat, and thus the liberation of humanity.

The Revolution Betrayed is one of the most important Marxist texts of all time. It is the only serious Marxist analysis of what happened to the Russian Revolution after the death of Lenin. In this book, Trotsky provided a brilliant and profound analysis of Stalinism, which has never been improved upon, let alone superseded. With a delay of 60 years, it was completely vindicated by history. Without a thorough knowledge of this work, it is impossible to understand the reasons for the collapse of the Soviet Union and the events since then in Russia and on a world scale.

On 27 November 1932, Leon Trotsky delivered a speech in Copenhagen (Denmark). It was the 15th anniversary of the revolution. In defending the October revolution he set the record straight on the real processes that unfolded in Russia 1917, as opposed to the doctored version presented by the Stalinists.

During the first two months of 1917 Russia was still a Romanov monarchy. Eight months later the Bolsheviks stood at the helm. They were little know to anybody when the year began, and their leaders were still under indictment for state treason when they came to power. You will not find another such sharp turn in history – especially if you remember that it involves a nation of 150 million people. It is clear that the events of 1917, whatever you think of them, deserve study. Originally published 1930.

The following editorial is the last known piece of writing by Rosa Luxemburg. It was written just after the Spartacus uprising was crushed by the German government and in the hours prior to the arrest and murder of her and Karl Liebknecht by the Friekorps.

This book is an excellent history of the Paris Commune. Its author Lissagaray was a direct participant and fought for the Commune on the barricades. He collected testimonies from the survivors in exile in London, Switzerland and consulted all documents available at the time to ensure accuracy. He was assisted by Karl Marx in the writing of this classic, which was translated to English by Eleanor Marx.