In the late 1940s, some areas of physics, especially quantum mechanics but also special and general relativity, were also criticized on grounds of "idealism". Soviet physicists, such as K. V. Nikolskij and D. Blokhintzev, developed a version of the statistical interpretation of quantum mechanics, which was seen as more adhering to the principles of dialectical materialism.[20][21] However, although initially planned,[22] this process did not go as far as defining an "ideologically correct" version of physics and purging those scientists who refused to conform to it, because this was recognized as potentially too harmful to the Soviet nuclear program.[citation needed]