哈迪阿旺
Yusof subsequently attempted to increase the influence of the "ulama" within PAS, surrounding himself with "ulama" leaders such as Nik Abdul Aziz Nik Mat and Abdul Hadi Awang. The direction of his leadership of the party was seen as firmly Islamist: under his presidency, the party adopted an Islamic State as official policy, and proposed to limit the powers of Parliament to be subject to the oversight of an "Ulama Assembly". At the same time, he steered the party away from Malay nationalism and introduced significant changes to the party's internal structure. One change was to introduce the position of "Spiritual Leader", of which he was the first occupant. His leadership style has been described as "fiery and outspoken". He resigned in 1989 citing health reasons, and was replaced by his deputy Fadzil Noor, who set the party on a more moderate path.