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lumpenproletariat (n.)[lumpenproletariat 词源字典]: 1897, from German Lumpenproletariat (1850), from Karl Marx, who coined it to mean "rabble, poorest of the working class," from German lump "ragamuffin" + proletariat. Secondary sense of "boorish, stupid people" led to lumpen- being taken as a suffix meaning "unenlightened."[lumpenproletariat etymology, lumpenproletariat origin, 英语词源]
Marxism (n.): 1885, probably immediately from French marxisme; see Marxist + -ism. From 1884 as Karl Marxism.
opium (n.): late 14c., from Latin opium, from Greek opion "poppy juice, poppy," diminutive of opos "vegetable juice."
Die Religion ist der Seufzer der bedrängten Kreatur, das Gemüth einer herzlosen Welt, wie sie der Geist geistloser Zustände ist. Sie ist das Opium des Volks. [Karl Marx, "Zur Kritik der Hegel'schen Rechts-Philosophie," in "Deutsch-Französische Jahrbücher," February, 1844]
The British Opium War against China lasted from 1839-42; the name is attested from 1841.