Popular Unity (Italy)
It was formed in April 1953 by disgruntled members of the Italian Democratic Socialist Party (PSDI) and the Italian Republican Party (PRI), who did not agree with the new electoral law approved by the Parliament with the support of their parties. Its leaders were Piero Calamandrei, a Democratic Socialist, and Ferruccio Parri, a Republican former Prime Minister. The party won 0.6% of the vote in the 1953 general election.
The party was active until 1957. After that, some of its members, including Parri, joined the Italian Socialist Party, but most of them returned to their former parties.