Left Ecology Freedom
SI was launched in November 2015 as a parliamentary group in the Chamber of Deputies (full name: Italian Left – Left Ecology Freedom), including Left Ecology Freedom (SEL), dissidents from the Democratic Party (see Future to the Left) and splinters from the Five Star Movement. At its launch, SI included 32 deputies, who were soon followed by 8 senators (who formed a sub-group within the Mixed Group of the Senate in February 2016) and 2 MEPs. SI was officially formed as a full-fledged party in February 2017, after SEL had chosen to merge into it in December 2016.