With the onset of World War I, the British stiffened censorship and restrictions on political activity. Azad's "Al-Hilal" was consequently banned in 1914 under the "Press Act". Azad started a new journal, the Al-Balagh, which increased its active support for nationalist causes and communal unity. In this period Azad also became active in his support for the Khilafat agitation to protect the position of the Sultan of Ottoman Turkey, who was considered the Caliph or Khalifa for Muslims worldwide. The Sultan had sided against the British in the war and the continuity of his rule came under serious threat, causing distress amongst Muslim conservatives. Azad saw an opportunity to energise Indian Muslims and achieve major political and social reform through the struggle. With his popularity increasing across India, the government outlawed Azad's second publication under the "Defence of India Regulations Act" and arrested him. The governments of the Bombay Presidency, United Provinces, Punjab and Delhi prohibited his entry into the provinces and Azad was moved to a jail in Ranchi, where he was incarcerated until 1 January 1920.