About 68% of the city's population follow Sunni Islam while 30% are Shiites (mainly the Hazaras and Qizilbash). The remaining 2% are followers of Sikhism and Hinduism, as well as one known Christian resident (First Lady Rula Ghani) and one Jewish resident (Zablon Simintov). It is estimated that there are 500–8,000 Afghan Christians in the country as a whole; due to restrictions on religious freedom, they often worship in secret, rendering it difficult to estimate the number of Christians in Kabul specifically. Kabul also has small Indian (which the Sikhs and Hindus belong to)  and Turkish communities (mostly business-owners and investors), and in the 1980s had a sizable Russian community during the Soviet campaign in the country.