尽人皆知 [- rén jiē zhī]be known to all; be common knowledge; be universally [widely] known; be well-known; Every barber knows that ...; give notice to all; make known to the public:
•¶尽人皆知, 张作霖是被日本人谋杀的。 It is common knowledge that Zhang Zuolin was murdered by the Japanese.