Who helped usher through all these deals and integrate countries to the extent they are today? It was parties who were meant to be left. Billy Clinton with NAFTA, Chrétien said he'd make changes, then got in and signed off on it. Mitterrand was at the helm of the EU, albeit with Kohl. And it's the same types of people today who are trying to keep it all going Obama with the TPP, Tony Blair's trying to stop Brexit. 

It's the great betrayal, everyone knew the right never cared about workers, but it was the left who enthusiastically signed off on this stuff at the expense of who they were meant to represent.