In the aftermath of World War I there was widespread political dissatisfaction with the royalty terms of the British petroleum concession, under the Anglo-Persian Oil Company (APOC), whereby Persia received 16% of "net profits". In 1921, after years of severe mismanagement under the Qajar Dynasty, a coup d'état (allegedly backed by the British) brought a general, Reza Khan, into the government. By 1923, he had become prime minister, and gained a reputation as an effective politician with a lack of corruption. By 1925 under his influence, Parliament voted to remove Ahmad Shah Qajar from the throne, and Reza Khan was crowned Reza Shah Pahlavi, of the Pahlavi Dynasty. Reza Shah began a rapid and successful modernization program in Persia, which up until that point had been considered to be among the most impoverished countries in the world. Nevertheless, Reza Shah was also a very harsh ruler who did not tolerate dissent. By the 1930s, he had suppressed all opposition, and had sidelined the democratic aspects of the constitution. Opponents were jailed and in some cases even executed. While some agreed with his policies, arguing that it was necessary as Iran was in such turmoil, others argued that it was unjustified. One such opponent was a politician named Mohammad Mosaddegh, who was jailed in 1940. The experience gave him a lasting dislike for authoritarian rule and monarchy, and it helped make Mosaddegh a dedicated advocate of complete oil nationalization in Iran.