Islam was the principal author of several landmark judgments, laying the foundations for the development of laws and setting significant precedents. These include the judgments on repeal of the Fifth Amendment of the Constitution of Bangladesh, upholding the judgment of the High Court Division sentencing the killers of Sheikh Mujibur Rahman , enlarging the powers of the High Court Division under The Companies Act (Bangladesh), 1994 in protecting the interests of minority shareholders, and reversing the decision of the High Court Division to allow the construction of markets in violation of the provisions of environmental laws.