Why was the publication of Boris Godunov delayed by censorship?

The publication of Aleksandr Pushkin’s historical tragedy Boris Godunov was delayed by censorship primarily because of the play's emphasis on the power of the people.1

In the work, Pushkin highlights the "judgment of the people" and their role in bringing the pretender, the false Dmitry, to the throne. By focusing on the political and moral significance of the masses in relation to the ruling classes, the play challenged the sensibilities of the censors of the time. Consequently, while written in 1824–25, the drama was not published until 1831.12