<unk> <unk> <unk> <unk> <unk>  Passage: Engels developed what is now known as Marxist theory together with Karl Marx and in 1845 he published The Condition of the Working Class in England, based on personal observations and research in English cities. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️ ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️ ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️ Additionally, Engels organized Marx's notes on the Theories of Surplus Value, which he later published as the "fourth volume" of Capital.<unk> Additionally, Engels organized Marx's notes on the Theories of Surplus Value, which he later published as the "fourth volume" of Capital. In 1884, he published The Origin of the Family, Private Property and the State on the basis of Marx's ethnographic research.  Question: Who is known to have edited two additional volumes of Das Kapital following the death of Marx?
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