Austria and Orthodox Russia in their wars against the Ottomans. In the 20th century, the power of Muslim, Catholic and Orthodox clergy was weakened during the years of monarchy and it was eradicated during the 1940s and 1950s, under the state policy of obliterating all organized religion from Albanian territories. During the Ottoman invasion the Muslims of Albania were divided into two main communities: those associated with Sunni Islam and those associated with Bektashi Shiism, a mystical Dervish order that came to Albania through the Albanian Janissaries that served in the Ottoman army and whose members practised Albanian pagan rites under a nominal Islamic cover. After the Bektashis were banned in Turkey in 1925 by Atatürk, the order moved its headquarters to Tirana and the Albanian government subsequently recognized it as a body independent from Sunnism. Sunni Muslims were estimated to represent approximately 50% of the country's population before 1939, while Bektashi represented another 20%. There is also a relatively small minority which belongs to the Ahmadiyya Muslim Community. Muslim populations have been particularly strong in eastern and northern Albania and among Albanians living in Kosovo and Macedonia. Islam (Sunni) Sunni Muslims have historically lived in the cities of Albania, while Bektashis mainly live in remote areas, whereas Orthodox Christians mainly live in the south, and Roman Catholics mainly live in the north of the country. However, this division does not apply nowadays. In a study by Pew Research, 65% of Albanian Muslims did not specify a branch of Islam that they belonged to. The Albanian census doesn't differentiate between Bektashis and Sunnis, but instead between Bektashis and "Muslims", but since Bektashis are in fact Muslim many were listed as Muslims. Bektashi-majority areas include Skrapari, Dishnica, Erseka and Bulqiza while Bektashis also have large, possibly majority concentrations in Kruja, Mallakastra, Tepelena, large pockets of the Gjirokastër and Delvina Districts (i.e. Gjirokastër itself, Lazarat, etc.), and Western and Northeastern parts of the Vlora district. There are also historically substantial Bektashi minorities around Elbasan, Berat, Leskovik, Perm, Saranda and Pogradec. In Kosovo and Macedonia there were pockets of Bektashis in Gjakova, Prizren and Tetova. In the Albanian census, a few of these areas, such as Skrapari and Dishnica, saw the Bektashi population mostly labeled "Bektashi" while in most other areas such as Kruja it was mostly labeled "Muslim". The classification of children of mixed marriages between Sunnis and Bektashis or the widespread