The Arab Democratic Unionist Party (Arabic: الحزب الاتحادي الديمقراطي العربي, al-Hizb al-Ittihadi al-Dimuqrati al-Arabi) was a social liberal political party in the Kingdom of Iraq during the early 20th century. The HIDA had 4% of the Iraqi electorate's vote by 1936, and it was a significant liberal party in the country, being smaller than the Reform Party of Iraq and larger than the Arab Socialist Union. The party supported a democratic Iraq instead of a monarchy, leading to it being repressed under the monarchy.
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