The government has made concerted efforts to erode the Shiite citizen majority and tip the country's demographic balance in favor of the Sunni minority, mostly by recruiting foreign-born Sunnis to serve in the security forces and become citizens. Meanwhile, hundreds of Bahrainis have had their citizenship revoked in recent years, including a number of Shiite leaders and activists. Since 2011, the government has maintained a heavy security presence in primarily Shiite villages. Security personnel restrict the movements of Shiite citizens and periodically destroy their property.