The Islamic revival of the late 20th century brought the topic of Sharia to international attention in the form of numerous political campaigns in the Muslim world calling for full implementation of Sharia. A number of factors have contributed to the rise of these movements, classified under the rubric of Islamism or political Islam, including the failure of authoritarian secular regimes to meet the expectations of their citizens, and a desire of Muslim populations to return to more culturally authentic forms of socio-political organization in the face of a perceived cultural invasion from the West. Islamist leaders such as Ayatollah Khomeini drew on leftist anticolonialist rhetoric by framing their call for Sharia as a resistance struggle. They accused secular leaders of corruption and predatory behavior, and claimed that a return to Sharia would replace despotic rulers with pious leaders striving for social and economic justice. In the Arab world these positions are often encapsulated in the slogan "Islam is the solution" ("al-Islam huwa al-hall").