It's Jewish authors themselves that nurture "conspiracy theory".
Take the following from Hilberg's The Destruction Of The European Jews
"Throughout their long period of exile, 'the Jews had always been a minority, always in danger, but had learned that they could avert or survive destruction by placating and appeasing their enemies."
Couple the preceding with;
"In 1948 "The Palestinian Issue" as it was known at the State Dept. had been long festering. Survivors of the holocaust were pouring into their Biblical homeland and demanding the creation of an independent Zionist state. For reasons both political and humanitarian, Truman wanted to help create a new state of Israel. He was, as well, under tremendous pressure from Jewish groups, whose support he badly needed to stay in the White House."
- The Wise Men, Six Friends And The World They Made. Walter Issacson and Evan Thomas, p.451
This "minority" who is "always in danger" can also decide the fate of an American President? Issacson and Thomas fail to define the aforementioned "Jewish groups". Therefore we don't even know if they were "American."
"Pouring" is a tad subjective. But as you like to ask, "WHERE DID THEY GO?"