The United Democratic Front was formed in opposition to the Pakistani party of which Prime Minister, who served from 1973-77?
Zulfikar Ali Bhutto: Zulfikar Ali Bhutto (Urdu: ‎ ; Sindhi: ذوالفقار علي ڀُٽو‎ ) ] ) (5 January 1928 – 4 April 1979) was a Pakistani politician who served as Prime Minister of Pakistan from 1973 to 1977, and prior to that as the fourth President of Pakistan from 1971 to 1973.
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