Really, 1960's red scare attacks?
Sorry, the liberal tradition goes back to the 18th Cent and was common in the US by the start of the 20th Cent. The social gospel is based on Jesus' teachings and the prophets. There's no reason to think that textual criticism has anything to do with what you say, particularly since the best practioners today are evangelicals. This seems to be a smear job with little connection to reality.
I invite people with a serious interest in where the social gospel came from to read Rauschenbush's book by that name.
However it really is true that communists tried to separate care for poor and disadvantaged from Christianity and turn it into political ideology. The answer isn’t to remove those parts of Jesus teachings, but to retain their connection with Jesus. Trying to remove care for others from Christianity does the work of secular ideologues, since given the alternative of a loveless Christianity and a caring political ideology, many will choose the latter.
Incidentally, the quote is from the Naked Communist. "In 1970, [the same author] authored the companion piece to The Naked Communist under the title The Naked Capitalist, in which he argued (in the form of an extended review of Carroll Quigley’s Tragedy and Hope) that the Communist conspiracy was a mere tool in the hands of an even bigger conspiracy run by rich capitalists."
https://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1099&context=englishfacpubs I think we're seeing the latter conspiracy playing out now. Or maybe the whole idea of explaining theology by conspiracy theory is a bad one,
Your thinking on that is a bit premature AND late, because the ex-KJV colonel Goliytsn who defected to the U.S. in the 1960's tried to warn the U.S. State Department about the Soviet's 1958 long-range disinformation plan against the west, and they wouldn't listen, so he asked permission to print about it in a book. This he did...
In Golitsyn's book
New Lies For Old, written in 1984 (NOTE THE DATE), he covered this matter of Soviet KGB infiltration in the Christian Churches just as Skousen did in his 1958 BOOK! Even the Solidarity movement in Poland involving churches there were involved in this later movement with KGB agents.
Golitsyn even predicted that if the Soviet's were in their THIRD AND FINAL PHASE of their long-range 1958 strategy against the west, they might allow the Berlin Wall to come down. Golitsyn wrote that prediction in 1984. The Soviets allowed the Berlin Wall to come down in 1989.
And ANY TRUE WESTERN CHRISTIAN that reads the REST of those 45 Soviet strategic points that Skousen outlined in his 1958 book
The Naked Communist, they will discover some of those points IN THE WORKING TODAY IN THE WEST, and many of them having already come true!
So brethren in Christ Jesus...
... don't pay attention to the Communist agents and spokespersons that hate the facts of how Skousen and Golitsyn revealed a REAL CONSPIRACY against the Christian West! Just some idiot TRYING... to use the word 'conspiracy' as synonymous with the idea of pushing lies ought to reveal how those against these revealings are PART OF THE CONSPIRACY THEMSELVES!
As for Carrol Quigely, Georgetown University history professor, and Bill Clinton's history professor when he went to Georgetown, Quigley HIMSELF revealed in his own.. book,
Tragedy and Hope, how he had been allowed to view "the Establishment's" secret records for a period of 2 years! And he ADMITTED that the "Establishment" Insiders often worked with Communism, and had NO problem doing so! Therefore, that is NOT about some fabricated conspiracy, Quigley himself said it! Not only that, but Quigley also said 'they' must have not liked what all he said in that book, because he had to SUE his publishers to find out why they destroyed the publishing plates to his book!!!
Now then, also... about the FACT that 'some' Capitalists SUPPORT COMMUNIST acts, one ought to read Rene A. Wormser's work
Foundations: Their Power and Influence which DOCUMENTS the findings of the 1952-1954 Reece Committee findings by the 82 Congress. The FACTS ARE... that some HUGE tax-exempt foundations, like the Ford, Carnegie, and Rockefeller, have been involved in funding SUBVERSIVE ACTIVITIES in the U.S.A. It is a MINDBLOWER back to 'reality' type of scholarly work by a lawyer who served on the committee...