Europe’s populist outbreak is set for a key test as voters in Italy go to the polls to choose a new government. Anti-establishment parties have enjoyed a surge in recent years, from Marine Le Pen’s National Front in France to the anti-migrant Alternative for Germany. Italy — where populist parties have traditionally done well — has Beppe Grillo’s Five Star Movement and the Northern League. Will they capitalize on the country’s immigration headache, stagnating economy and anti-establishment sentiment?

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