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In page Esperanto culture:

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Esperanto literature and organisations such as the Universal Esperanto Association (Sennacieca Asocio Tutmonda or SAT) often advocated against nationalism, leading to several fascist governments attempting to ban and eradicate its usage: Germany, Francoist Spain,[3] Portugal,[3] as well as in the Soviet Union.[4] However, the level to which this discrimination was due to association with Judaism and Jewish people cannot be fully known; Hitler wrote of it as intrinsically Jewish and called it a "Jewish weapon" in his Mein Kampf.[5] Following this history of suppression, Esperanto literature frequently concerns themes of resistance and anti-nationalism,[citation needed] though not all criticism of Esperanto is grounded in politics (See Esperanto#Criticism).