The text shows how religious censors eventually retreated, in part because Spinoza, Paine, Carlile, Mill, and others cogently argued that intellectual progress depended on free expression. But readers will see that modern secular ideologues—notably Fascists and Communists—have attacked free speech as brutally as religious inquisitors. Turning to the twenty-first century, Mchangama limns the strange evolution that turned progressive activists celebrating social media enabling Obama to defy establishment control into advocates of 'content moderation,' censorship intended to still the Twitter storms of Trump and his supporters. A provocative exploration of a transformative political right..