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Young Turk Revolution and aftermath

The Unionists found themselves at the behest of a spontaneous revolution in 1908, which commenced with Niyazi and Enver's flight into the Albanian hinterlands. Talaat's role during the Young Turk Revolution was to organize a plot to assassinate the garrison commander of Salonika, Ömer Nazım, who was a Hamidian loyalist and spy master of the area. Nazım survived his hired Fedai with injury, but the incident, as well as other assassinations carried out by the CUP during the revolution, intimidated the Hamidian establishment enough to reopen the parliament and reinstate the constitution. For the first time in three decades, an election was held for the Chamber of Deputies, which this time featured political parties. Talaat was easily elected into parliament as Union and Progress's candidate for deputy of Adrianople, and then was elected the parliament's deputy-president under Rıza.

A year later in the 31 March Incident, what started out as an anti-Unionist demonstration in the capital quickly turned into an anticonstitutionalist-monarchist counter revolution where Abdul Hamid attempted to reestablish his autocracy. The Grand Vizier Hüseyin Hilmi Pasha was forced to resign for Ahmed Tevfik Pasha. Khachatur Malumian, leader of the Dashnak Party, hid Talaat and Dr. Nazım in his house while mob violence targeted MPs. Three days later, Talaat and 100 MPs escaped Constantinople for Ayastefanos (Yeşilköy) to organize a separate national assembly from the volatile situation in Constantinople, and declared the change in government illegal. Relief came in the form of pro-constitutionalist forces known as the Action Army led by Mahmud Şevket Pasha, which stopped in Ayastefanos before marching on the capital; it was secretly agreed there that Abdul Hamid would be replaced by his brother. After the reactionary revolt was crushed, Talaat bullied the Shaykh al-Islam Sahip Molla to get a fatwa for Abdul Hamid's deposition, and convinced Tevfik Pasha to step down and return Hilmi Pasha to the premiership. With the fatwa, the parliament voted to depose Abdul Hamid II. Talaat and Ahmed Muhtar Pasha headed the delegation to announce to Prince Reşad of his ascension to the throne.

In August 1909 Mehmed Talaat led a 17-member parliamentary delegation to Westminster. He learned there that he was appointed Minister of the Interior in Hilmi Pasha's cabinet reshuffle, becoming the second Unionist with a cabinet position (first being Cavid as Finance Minister). He continued Hamidian era anti-Zionist restrictions in Ottoman Palestine, as well as enforce imperial rule in revolting provinces like Albania and Yemen. That year, Louis Rambert, director of the Régie des Tabacs, wrote that Talaat was "the acknowledged head of the Committee of Union and Progress and the Young Turks." Biographer Hans-Lukas Kieser writes that he was under the influence of Bahattin Şakir and Mehmed Nazım before 1908, but after late 1909 he had an increased interest in the new Central Committee member Ziya Gökalp and his more revolutionary and Pan-Turkist ideas.