sentences:  He was the president of the Constitutional Court of Turkey, from May 8, 1991 until May 8, 1995, and from May 25, 1995 until January 1, 1998, when he retired.He also was the head of ""Atatürkçü Düşünce Derneği"" (ADD), a leading Turkish non-governmental organization, that has organized Republic Protests, a peaceful mass rally of more than 300,000 people, in Ankara, on April 14–15, 2007.Recently, he was implicated in the Ergenekon scandal, for allegedly being a CIA .