These divisions led to a number of splits and mergers. In the final period, despite an
apparent initial success, the PSI became uniformly centrist and increasingly corrupt, until
it finally sank in a sea of debts and arrest warrants resulting from the Tangentopoli
investigations. For fifty years before that, the PSI had navigated a course between the DC
and the PCI, at times risking being overwhelmed by one or the other and at times able to
exploit its pivotal position between the two.
The old pre-Fascist Socialist Party had very little in the way of underground
organization at the time of the fall of Fascism (see fascism and neo-fascism), but in
August 1943 the Socialist old guard came together with two new groups, the Milanese
Movimento di Unità Proletaria (Movement of Proletarian Unity) led by Lelio Basso and
the Roman Unione Proletaria Italiana (Italian Proletarian Union) led by Giuliano Vassalli,
to form the Partito Socialista Italiano di Unità Proletaria (see PSIUP) with Pietro Nenni
as its leader. In the 1946 elections for the Constituent Assembly, it figured as the biggest
party of the Left, leading the PCI by a small margin. However, in 1947 the social
democratic wing of the party broke away to become the PSLI (changed in 1952 into the
PSDI), while what was left became the PSI (Italian Socialist Party). In the national
elections of 1948, the PSI went into an electoral alliance with the PCI as the Popular
Democratic Front (FDP). The move proved massively unsuccessful for the Left (they
won much less in 1948 than the two parties had won separately in 1946) and absolutely
disastrous for the PSI, which was overwhelmed by the Communist Party’s organization.
The setback pressured the party first into striving for organizational independence and
then, increasingly after the Twentieth PCUS conference and the Soviet invasion of
Hungary in 1956, into ideological independence as well. Partly because of these changes
and partly because of the DC’s electoral decline, the PSI began negotiating with the
Catholics in 1960 for places in local government, which eventually led to the first centre-
left national government in 1963 with Nenni as deputy prime minister.
However, the left wing broke away the following year, again taking up the name of
PSIUP; this weakened the PSI’s influence in government, but nonetheless some elements
of their programme were realized, including the nationalization of ENEL, an increase in
the school leaving age and later, the Workers’ Statute, divorce law and, in the 1970s,
various civil rights measures. As a result of the experience of government and of the
PSI’s general move towards the centre, the PSI and the PSDI reunited in 1966. In the
polarized climate of the late 1960s, the result was again disastrous electorally, and so in
1969 they parted company once more.
The early 1970s was a period of confusion for the PSI, with some in the party
enthusiastically taking part in government—which also meant in clientelism and
corruption—and some attempting to remain faithful to socialist principles and traditions.
As the Times put it, when the PSI had made a poor showing in the 1975 regional
elections, the Socialists had ‘disappointed their supporters by the eagerness with which
they leapt onto the gravy train and the mess which some of their leaders made while
spreading it about’ (18 June 1975).
The party left government, although it continued to support the so-called
‘governments of national unity’. Then in 1976, Bettino Craxi was elected secretary.
Initially a compromise candidate, he soon consolidated his position within the party,
maintaining a clear distance from the PCI and emphasizing the PSI’s European social
democratic vocation. In 1980 the Socialists were back in the governing coalition, and in
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