> When did the soviets deny physical phenomena like the photoelectric effect? I believe they had issues with the kind of non-falsifiable metaphysical arguments

> When did the soviets deny physical phenomena like the photoelectric effect? I believe they had issues with the kind of non-falsifiable metaphysical arguments put forward to try to explain or understand quantum mechanics. There were many, but the most famous example is probably Lysenkoism, https://en.wikipedia.org/wiki/Lysenkoism https://en.wikipedia.org/wiki/Lysenkoism