The late 20th century saw an increase in the number of mosques used for political purposes. While some governments in the Muslim world have attempted to limit the content of Friday sermons to strictly religious topics, there are also independent preachers who deliver khutbas that address social and political issues, often in emotionally charged terms. Common themes include social inequalities, necessity of jihad in the face of injustice, the universal struggle between good and evil, with the West often symbolizing moral and spiritual decadence, and criticism of local rulers for corruption and inefficiency. In Islamic countries like Bangladesh, Pakistan, Iran, and Saudi Arabia, political subjects are preached by imams at Friday congregations on a regular basis. Mosques often serve as meeting points for political opposition in times of crisis.