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At the era of Ottoman Turkey, executioners were institutionalized during the 15th century.
They were chosen among deaf and mute people.
People doing this dirty job were taken almost only from two ethnicities: Croats and Gypsies.
Subalterns and Social Protest: History from Below in the Middle East
by Stephanie Cronin
Why these two ethnicities? There might be different reasons but that is history-wise noteworthy detail anyway imo
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