Rosa Luxemburg is one of the most significant political figures of the twentieth century: she developed an analysis of imperialism that apprehended not only its economic and political, but also its social, cultural, and human dimensions; she resolutely opposed capitalist militarism; she was a leading theorist and strategist; and she was an activist, from her first party work among miners in upper Silesia, through her speaking tours to mass crowds after the 1905 Russian revolution, to her agitation among revolutionary workers on the streets in the final days of her life.