Throughout most of the 20th century, Argentina had one of the largest, strongest, and most militant organized labor movements in the Western Hemisphere. While the roots of the labor movement can be traced to colonial times and the craft guilds of that era, European immigrants, particularly from Italy and Spain, who were political refugees from the unrest of the mid-19th century were key to the development of the Argentine labor movement. During much of the late 19th century, the labor movement was predominantly under anarchist influence, although during and after World War I, syndicalists,...