Blue graffiti decrying “tyranny” was scrawled on the Tweed Courthouse building in lower Manhattan, cops said Tuesday.

The graffiti was painted on the four pillars that stand at the top of the stairs outside the Italianate-style building that houses the city Board of Education at 52 Chambers St.

“Unconstitutional Murder Lower Economic Education Feudal Class,” was painted onto one of the building’s columns.

Another message read, “100% Employer Discriminate,” while others included “Superior Erudite Tyrants,” “Erode Tyranny” and “Cognitive Disonance Murder By Civil Disobedience.”

A sixth message read: “Human Rights ERA Plato Wilfred Socrates.”

Workers were removing the messages with a sandblaster and solvent, a witness said.