Reason's Volokh Conspiracy blog has published a short excerpt from Jacob Mchangama's September 3 post on Frederick Douglass and free speech. The excerpt itself is truncated—ending with "Frederick Douglass was…"—but the post's headline makes clear that Mchangama is examining Douglass's views on free expression. The editors note that the full post is worth reading.
Because there is only one source, there are no conflicting accounts. The item serves as a pointer to Mchangama's longer analysis, which Reason recommends to its readers. For those interested in the intersection of historical figures and First Amendment debates, the full post is the substantive piece.