First published in 1976. The year 1970 saw the 150th anniversary of the birth of Friedrich Engels who was Karl Marx's most intimate friend and collaborator. Today the disciples of Marx and Engels are numbered in millions and the way of life of great states is based upon their doctrines. An understanding of the career and work of Friedrich Engels is essential to an appreciation of the origin and development of the Marxist form of socialism in the nineteenth century. This is the first volume in a set of two.