A reform movement known as COREL (Committee to Promote Referendums on Elections), led by maverick DC-member Mario Segni, proposed three referendums, one of which was allowed by the Constitutional Court (at that time packed with members of the PSI and hostile to the movement). The June 1991 referendum therefore asked voters if they wanted to reduce the number of preferences, from three or four to one, in the Chamber of Deputies, to reduce the abuse of the open-list system by party elites and ensure accurate delegation of parliamentary seats to candidates popular with voters. With 62.5% of the Italian electorate voting, the referendum passed with 95% of those voting in favor.