On December 19, 1977, he was elected a board member of the Urfa Branch of the Idealists’ Union (ÜOD) (Grey Wolves).
On January 26, 1978, he was wounded in an armed clash with opposing groups.
Since 1990, due to his ties with the organized crime, he was involved in the activity of collecting money for checks and vouchers in Istanbul.
Besides, he had correspondence with fugitives and wanted ultra-nationalist activists abroad.
On 5 August 2013 Yasak was sentenced to six years and three months as part of the Ergenekon trials.