there's a bit of a history of ei in canada here (from a "progressive" source) that explains that it was basically lifted from fdr by a conservative, and then fixed and expanded by the liberal oligarch mackenzie-king, the longest serving pm in the country's history, and also the country's first labour minister.

https://policyoptions.irpp.org/magazines/employment-insurance/a-short-history-of-ei-and-a-look-at-the-road-ahead/