In the 1930s, several organizations opposing or demanding reform of the Zaydi imamate sprung up in the city, particularly Fatat al-Fulayhi, a group of various Yemeni Muslim scholars based in Sanaʽa's Fulayhi Madrasa, and Hait al-Nidal ("Committee of the Struggle.") By 1936 most of the leaders of these movements were imprisoned. In 1941 another group based in the city, the Shabab al-Amr bil-Maruf wal-Nahian al-Munkar, called for a ''nahda'' ("renaissance") in the country as well as the establishment of a parliament with Islam being the instrument of Yemeni revival. Yahya largely repressed the Shabab and most of its leaders were executed following his son, Imam Ahmad's inheritance of power in 1948. That year, Sanaa was replaced with Ta'izz as capital following Ahmad's new residence there. Most government offices followed suit. A few years later, most of the city's Jewish population emigrated to Israel.