In mid-1952, Britain's embargo of Iranian oil was devastatingly effective. British agents in Tehran "worked to subvert" the government of Mosaddegh, who sought help from President Truman and then the World Bank but to no avail. "Iranians were becoming poorer and unhappier by the day" and Mosaddegh's political coalition was fraying. To make matters worse, the Speaker of the Parliament Ayatollah Kashani, Mosaddegh's main clerical supporter, became increasingly opposed to the Prime Minister, because Mosaddegh was not turning Iran into an Islamic state. By 1953, he had completely turned on him, and supported the coup, depriving Mosaddegh of religious support, while giving it to the Shah.