Does their study define populism somewhere? Skimmed it and I have no idea what it really means. Would Wobblies be considered populist? If you think free trade s

Does their study define populism somewhere? Skimmed it and I have no idea what it really means. Would Wobblies be considered populist? If you think free trade should be extremely gated by Western style human rights standards (gender equality, free speech, free religion, if not representative government) is that populist? Or is the term just being repurposed as code for isolationism and xenophobia?