Friedrich Engels was a Communist thinker. (PROSE: The Cabinet of Light) Amanda had read some of his works. (PROSE: The Winning Side)

Behind the scenes[]

In TV: The Sun Makers, the exchange between Mandrel and the Doctor, "What have we got to lose?" "Only your claims," riffs on a common paraphrase of the final lines of The Communist Manifesto by Karl Marx and Friedrich Engels, "What have you got to lose? Only your chains." The official English translation of the line is "The proletarians have nothing to lose but their chains."