Labour Party (UK)

In or Out? Britain faces vital EU membership vote June 23

British voters will decide in one month whether or not to deal a historic hammer blow to European integration by putting their island nation on an independent path outside the European Union.

The choice on June 23 is simple: In or Out. But the ramifications of a vote to leave are complex and uncertain.

The campaign has hardly been a model of cool, reasoned argument. "Leave" campaigner and former London Mayor Boris Johnson has compared the EU's goals to those of Adolf Hitler, while "Stay"-supporting Prime Minister David Cameron has suggested that a decision to leave the 28-nation bloc would please Islamic State extremists.

EU advocates argue that...