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Imprisoned for 12 years, Mamadou Dia was a Senegalese politician who served as the first Prime Minister of Senegal from 1957 to 1962. He was a prominent figure in the country's independence movement and played a key role in shaping Senegal's post-independence policies. However, his tenure as Prime Minister was marked by political instability and economic challenges, leading to his arrest and imprisonment in 1962.