Syed Husin bin Ali (23 September 1936 – 29 June 2024) was a Malaysian academic and politician who served as president of the left-wing Parti (Sosialis) Rakyat Malaysia. He was also a prominent political detainee, who was held for six years without trial under Malaysia's Internal Security Act, from 1974 to 1980. Following the merger of Parti Rakyat Malaysia with Parti Keadilan Nasional, he held the position of deputy president of the merged entity Parti Keadilan Rakyat from 2003 to 2010. He also served two terms in Malaysia's Senate (the Dewan Negara) from 2009 to 2015.
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