Social Reform or Revolution? (German: Sozialreform oder Revolution?) is an 1899 pamphlet by Polish-German Marxist theorist Rosa Luxemburg. Luxemburg argues that trade unions, reformist political parties and the expansion of social democracy, while important to the proletariat's development of class consciousness cannot create a socialist society as Eduard Bernstein, among others, argued. Instead, she argues from a historical materialist perspective that capitalism is economically unsustainable and will eventually collapse and that a revolution is necessary to transform capitalism into socialism. The pamphlet was heavily influential in revolutionary socialist circles and along with Luxemburg's other work an important precursor to left communist theory.

Is Marxism really dead, or can it play a positive role in creating a just and fulfilling society? This study responds to these questions with a penetrating assessment of Marxism from its origins to the present day. Roger Gottlieb provides an incisive overview of the content, strengths and weaknesses of Marx's own work, and demonstrates how the socialist and communist movements between 1880 and 1935 betrayed the original vision of Marxism. He argues that theory was "reborn" in Western Marxism and socialist-feminism, and offers lucid accounts of their theories of social structure, oppression and revolution. The concluding chapters focus on important contemporary concerns: Marxist theories of present-day capitalism; current debates between Marxism and other radical perspectives, including postmodernism; and Marxism's confrontation with socially engaged spirituality. This study provides a thoughtful dialogue on the meaning of Marxism in the modern world.

Mandel's essays are a spirited affirmation of internationalism, macropolitics, political economy, and class analysis. Unashamedly committed to progress, he rightly refused to ignore capitalism's myriad victims or to scrap what Marxism and Leninism offer to the struggle for emancipation; such spirited engagement is a remarkable and welcome achievement.