A mathematics professor at St. Joseph’s University is suing the school after it canceled him for an anonymous tweet mocking a controversial policy proposal that would have the government pay monetary reparations to the descendants of slaves. Professor Gregory V. Manco, who was subsequently demoted, claims that he was accosted by an online mob for engaging in legally protected speech that expressed his personal opinions, and that the school made things worse. Manco might be called a libertarian. According to Legal Insurrection, he “has written op-eds on political topics expressing such views,” including one stating that people should combat racism with “individualism, capitalism [and] limited government” and arguing against “white fragility” training. Slavery itself was abolished in the United States by the Thirteenth Amendment to the Constitution, which was ratified in 1865, months after the end of the Civil War, in which slavery was a major issue. The amendment states: “Neither …