"Liberalism manifests itself in various ways....

To hear incorrect views without rebutting them and even to hear counter-revolutionary remarks without reporting them, but instead to take them calmly as if nothing had happened. This is a sixth type."

Selected Works of Mao Tse-tung

COMBAT LIBERALISM September 7, 1937

https://www.marxists.org/reference/archive/mao/selected-works/volume-2/mswv2_03.htm