Further unpublished works, Ideas y suggestiones para una nueva estrategía revolutionaria (Ideas and Suggestions for a New Revolutionary Strategy) and Delincuencia política (Political Criminality), along with the rest of his extensive archives, are held in Amsterdam at the International Institute of Social History.
After World War II broke out, Witkop, like her husband and other anarchists such as Max Nettlau and Diego Abad de Santillán, supported the Allies because she felt Nazism could not be defeated with pacifist means.
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