Yes, you are very correct! Nice history lesson!
The term progressive goes back much farther in US history than 1948........to before the turn of the 19th century....progressives weren’t liberals/socialists/communists back then.......
Side note:
While attending a Townhall meeting this past summer, I was assualted by a lady wearing a “Progressive Democrats for America” t shirt........
I had asked her about the organization, and she described it in glowing terms.... when I said that “Progressive was a term most often used by Socialists and Communists groups, which one are you? She blew up and punched me.......LOLOLOLOL
Searching PDFA’s website shows the usual suspects, far, far lefty and communist types.....wanna tee a socialist off.....call em a socialist....works every time!
I could never understand why the liberals changed their name to progressives. Anyone familiar with American history would know that the Progressive Party of the 1940s was synonomous with the Communists. They were far left.