The objective of this study is to highlight the Movement in Sind against the centralist tendency of the Federal Government. The strong centralist tendencies were continuing in Pakistan from very outset. It gave birth to One Unit scheme in Pakistan. The idea of amalgamation of whole West Pakistan into a single province was initiated by Feroz Khan and Jahanara Shah Nawaz. One Unit Scheme was one of the unilateral decisions by political elites, which demonstrated and intended strong center by ignoring the true sense and spirit of federalism. A strong movement as vanguard against One Unit scheme and policies emerged from Sindh to counter the centralist leaning and protection of provincial autonomy. Finally, the journey of constitutional evolution and achievement of the consensus in the 1973 Constitution to the series of amendments up till the famous Eighteenth Amendment is reliant upon the political awareness and struggle against the One-Unit Scheme.
Key words: Federalism, One Unit Scheme, Sindh Hari Committee, Opposition Movement