You can read a lot of the stories from Analog, the magazine that Campbell edited for many years, here: https://www.freesfonline.net/Magazines2.html. I was a fan back in the day, but going back now I see a lot not to like. And certainly many of the stories involved ESP.
That article links it back Joseph Rhine, and then to Arthur Conan Doyle and spiritualism. Ultimately maybe the blame lies with Emanuel Swedenborg for inspiring every kind of woo-woo.
https://en.wikipedia.org/wiki/John_W._Campbell