The two theories of heredity may have been spectacularly opposite—the Nazis were as obsessed with the fixity of identity as the Soviets were with its complete pliability—but the language of genes and inheritance was central to statehood and progress: it is as difficult to imagine Nazism without a belief in the indelibility of inheritance as it is to conceive of a Soviet state without a belief in its perfect erasure. Unsurprisingly, in both cases, science was deliberately distorted to support state-sponsored mechanisms of “cleansing.” By appropriating the language of genes and inheritance,
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