Progressive before the 1970's were always nationalist, definitely not internationalist because internationalism is un-American like hyphenated-Americanism is un-American.
RR: Teddy Roosevelt: "No Room in This Country for Hyphenated Americans"
Marxist, internationalist socialist were not nationalist and always wanted to overthrow the American government either through force or since the 1970's from within.
Nationalist socialist were around before Nazism.
Who wrote the Pledge of Allegiance and directed that school children should salute the American flag with the hand pointed out towards the flag ? An American nationalist socialist who was also a supporter of the progressive movement.
BTW: From the early 1900's until 1965 it was the progressives who wrote our immigration laws.
UVM History Review vol. 6 Dec. 1994: Lund
A good read. -> https://archive.org/details/reportsimmigrat00dillgoog