A right-wing government under Aleksandar Tsankov took power, backed by the Tsar, the army, and the VMRO. The September Uprising began in 1923, after the 9 June coup d'état, when Alexander Stamboliyski was planning to capture Pazardzhik with his sympathizers to restore his power, which was quickly disrupted by the Bulgarian Army. He was then captured and relocated to Slavovitsa, his birthplace, where he was tortured and killed by IMRO agents. Tsankov's government arrested over 2000 alleged communists in which uprisings began. Vasil Kolarov and Georgi Dimitrov, who were the main leaders of the uprisings, chose Montana as the centre. Many uprisings began in the Northwestern parts of Bulgaria, which were quickly overpowered by the army. The Communist leader Georgi Dimitrov fled to the Soviet Union. There was savage repression in 1925 following the second of two failed attempts on the Tsar's life in the bomb attack on Sofia Cathedral (the first attempt took place in the mountain pass of Arabakonak). But in 1926, Boris persuaded Tsankov to resign in favour of a more moderate government under Andrey Lyapchev. An amnesty was proclaimed, although the Communists remained banned. Lyapchev was considered to be more lenient towards the political opposition than Tsankov. The Communists re-emerged in 1927 under the guide of the political party Bulgarian Workers' Party. An independent workers' trade union became the centre of workers' political activity. Under the Macedonian prime minister, the IMRO also had much more freedom. This meant that political assassinations and acts of terrorism could continue unabated. IMRO raids into Yugoslavia ended Bulgaria's rapprochement with that country. The Macedonians demanded preferential economic treatment under Liapchev. the late 1920s brought relative political stability to Bulgaria compared with the previous years. Lyapchev was the leader of a conservative majority in the Sabranie. The press was relatively free, and the institutions of education and the judiciary were functioning independently. Output in industry and agriculture was finally above pre-war levels, and foreign investment was on the rise. But even after being substantially reduced, Bulgaria's reparations payments in 1928 amounted to 20 per cent of its budget, and the return to the Gold standard in that year weakened the economy a year before the Great Depression began. In foreign policy, Lyapchev tried unsuccessfully to improve the terms of British and French reparations from the First World war and to bring Bulgaria out of its post-war diplomatic isolation. The country had