Following the mass protests that took place in 2011, which demanded the resignation of al-Assad, al-Qaeda affiliated groups and Sunni sympathizers soon began to constitute an effective fighting force against al-Assad. Before the Syrian Civil War, al-Qaeda's presence in Syria was negligible, but its growth thereafter was rapid. Groups such as the al-Nusra Front and the Islamic State of Iraq and the Levant have recruited many foreign Mujahideen to train and fight in what has gradually become a highly sectarian war. Ideologically, the Syrian Civil War has served the interests of al-Qaeda as it pits a mainly Sunni opposition against a secular government. Al-Qaeda and other fundamentalist Sunni militant groups have invested heavily in the civil conflict, at times actively backing and supporting the mainstream Syrian Opposition.