|Born||1 January 1857|
|Died||29 December 1927 (aged 70)|
|Political party||Labour Party (1882–1892)|
Socialist Party (1892–1922)
Costantino Lazzari was born in Cremona, on 1 January 1857. He was an artisan and since his adolescence he was a member of the left-wing trade unions. In 1882 Lazzari founded with Giuseppe Croce the Italian Labour Party
Lazzari was the leader of the revolutionary wing of the Socialist Party, known as Massimalisti. In 1912 he was elected Secretary of the Socialist Party and led the party in the 1913 general election, where the PSI gained 17.6% of votes, arriving second after the governing Liberal Union of Giovanni Giolitti. In 1919 Lazzari resigned as Secretary.
In 1922 he was expelled from the PSI, accused of being a close ally of the new-established Communist Party.
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