Another change Sadat made from the Nasser era was a bow towards the Islamic revival. Sadat loosened restrictions on the Muslim Brotherhood, allowing it to publish a monthly magazine, al-Dawa, which appeared regularly until September 1981 (although he did not allow the group's reconstitution).[19] In 1971, the concentration camps where Islamists were held were closed, and the regime began to gradually release the imprisoned Muslim Brothers, though the organisation itself remained illegal; the last of those still behind bars regained their freedom in the general amnesty of 1975.