Results from the general secretary election for Unison (Britain's biggest trade union) show the enormous potential strength of the left, if united. The left wing must now look ahead and fight for a majority on the union NEC – a key step in transforming the labour movement.

We are publishing the first of what will be a series of Marxist study guides. The purpose is to provide a basic explanation of the fundamental ideas of Marxism with a guide to further reading and points to help organise discussion groups around these ideas. We are starting with dialectical materialism, the philosophy of Marxism.