Jeremy Corbyn and Len McCluskey collaborated to help achieve the biggest electoral success for socialism in recent British history. The two men share a passionate belief in a fairer, more equal Britain, encapsulated in Labour's election slogan "For the many, not the few." That slogan, inspired by Shelley's famous poem The Masque of Anarchy, points to something else the two have in common: a lifelong enthusiasm for poetry. In this sparkling...