Final answer:
The Sedition Act of 1798 was criticized for curtailing freedom of speech and the press, thus threatening democracy and conflicting with First Amendment rights. These actions by the Federalists were seen as attempts to suppress opposition, creating a legacy of controversy around the legislation.
Step-by-step explanation:
The Sedition Act of 1798 faced criticism for reasons tied to its clash with fundamental democratic principles, particularly the encroachment on freedom of speech and the press. Critics argued that by punishing individuals for expressing their views, the Act threatened the very essence of democracy and contradicted protections outlined in the First Amendment of the U.S. Constitution. Notably, the fact that ten people were convicted under the Sedition Act highlighted the law's concrete impact on quelling dissent, an approach many perceived as hostile to the ideal of a free society.
The Act's controversy also stemmed from the broader political context in which the Federalists pursued charges against those who criticized the government, efforts that were interpreted as means to suppress Republican opposition. Historical cases, such as the prosecution of Matthew Lyon, amplified the perception that the Sedition Act was used as a political weapon rather than a legitimate safeguard of national security. With the expiration and non-renewal of the Act in 1801, the subsequent legislative actions underscored the strength of opposition to such restrictive measures.