Haider was first enrolled as an advocate for the subordinate courts in June 1967. He has practiced law in different courts of the country, including the High Courts, since 1972, and in the Supreme Court of Pakistan since 1978. He has been member of the Executive Board/Committees of a number of organisations, including Pakistan Institute of International Affairs and the Sindh Red Crescent Society, and a Trustee of the Shaheed Zulfiqar Ali Bhutto Sports Foundation. He is also a member of the Bar Associations of the Sindh and Lahore High Courts.
Political career
Haider has, since early in his career, been an outspoken critic of the involvement of the Army in the political affairs of Pakistan. He was a founding member of the Movement for Restoration of Democracy and one of the main organizers of its Mass Movement, launched in 1983, for removal of Martial Law and Restoration of Democracy. He was the Central Acting Convener, Acting Central Secretary General and Acting Joint Secretary of the MRD. From 1981 to 1986, he was detained at least ten times by the Martial Law authorities. Haider was President of the Karachi Division of Qaumi Mahaz-e-Azadi from 1977 to 1982, and Secretary General of QMA from 1983 to 1988. Haider later joined the Pakistan Peoples Party, where he was appointed the Advisor to the Chief Minister Sindh from January 1989 to February 1990. He was the President of the PPP Karachi Division, Vice-President of PPP Sindh, and member of the Central Executive Committee of the PPP. On 22 March 2005, Haider resigned from the PPP to pursue his human rights interests. Haider was elected as a Senator in March 1991. He is member of the Senate Standing Committees on:
Defence, Defence Production, and Aviation
Information and Broadcasting
Culture, Sports and Tourism
Women Development
Youth Affairs
He is also a member of the Functional Committee on Human Rights.
Human rights
Haider's passion was human rights. He has done work for victims of honour killing, karo-kari, bonded labour, and missing persons, amongst others. He founded the Human Rights Ministry during the second tenure of Shaheed Benazir Bhutto and became the first Human Rights minister of Pakistan. He sat in the Senate Committee on Human Rights, was one of the founding members of the HRCP, and continues to pursue human rights causes in Pakistan. He drafted and tabled the first ever bill on Honour Killing. His recent activities included launching a strong campaign against the government and Inter-Services Intelligence in relation to missing persons and formation of 'The Forum for Secular Pakistan' to counter the narrative of religious and sectarian hate and violence.