Italy Hands Antiestablishment Parties New Task: Governing

Parties now face challenge of melding their two programs—one that calls for deep tax cuts, the other for enormous welfare spending

ROME—A coalition government between two of Italy’s antiestablishment parties was sworn in Friday, but deep differences between the two partners are raising questions over how the new government will implement its bold promises and how long it will last.

The maverick 5 Star Movement and hard-right League reached a deal on Thursday to form a new government and took an oath of office on Friday.

The...