1991 Italian electoral law referendum

In 1990 a group of reformers, led by Mario Segni, allied with the Radical Party began calling for change to a political system that had seen the Christian Democracy and the Italian Communist Party emerge as the two largest parties in almost every election since World War II. They argued that this caused chronic inefficiency and that the adoption of the Westminster system would lead to a period of political strength. Initially they promoted a referendum on abolishing multiple preference votes in the open list proportional representation system used since 1946. They argued that the system had led to minor lobbies inside parties, with group of candidates allied against other candidates of the same list, causing instability.