People across the country denounced this atrocity.
Tips
register
声讨 is heavy register - it implies public, collective, often morally outraged condemnation, not just personal disagreement. Common in news headlines about war crimes, scandals, or social-media pile-ons.
history
The compound dates from classical military usage: 声 "proclaim publicly" + 讨 "punish/launch a campaign against" - originally describing how a general would issue a public statement of grievances before launching war on a vassal state.
