[chimeracoder]

> Except the term "progressives" was coined by Marxists and socialists in the 1930s to separate themselves from liberals.

In the US, the term "progressive" is much older than that. The party you're referring to is the third "progressive" party, started by Wallace in 1948. The first was in 1912, and the usage of the term goes back to the 19th century: https://en.wikipedia.org/wiki/Progressive_Party_(United_Stat...

The three parties had distinct platforms and motivations, and each used the term in ways that would be inconsistent with contemporary usage of the word. OP is clearly referring to contemporary usage of the word, so there's no reason to bring up the mid-20th century version of the party in that context.