Leo Panitch, Sam Gindin, and Stephen Maher provide a newly updated and expanded primer for twenty-first century democratic socialists. The Socialist Challenge Today presents an essential historical, theoretical, and critical perspective for understanding the potential as well as the limits of three important recent phenomena: the Sanders electoral insurgency in the United States; the Syriza experience in Greece; and Corbyn's leadership of the Labour Party in the United Kingdom. The renowned coauthors compellingly convey the importance of developing strategic and practical capacities to democratically transform state structures so as to render them fit for realizing collective democracy, social equality, sustainable ecology, and human solidarity.