For 10 points, name this man more famous for co-authoring the Communist Manifesto with Karl Marx.
In one work, this man claimed that the "vulgar democracy" of the 1848 French Revolution was "obsolete in every respect" and urged revolutionaries to instead seek power through peaceful means. Apart from The Tactics of Social Democracy, this man also wrote a critique of Eugen Duhring that included the chapter Socialism: Utopian and Scientific.  This co-author of The Holy Family spoke out against marriage in The Origin of the Family, Private Property, and the State and against the horrors of industry in The Condition of the Working Class in England in 1844.  For 10 points, name this man more famous for co-authoring the Communist Manifesto with Karl Marx.
In one work, this man claimed that the "vulgar democracy" of the 1848 French Revolution was "obsolete in every respect" and urged revolutionaries to instead seek power through peaceful means.
Fredrich Engels