---
title: 'Beware: Spreading Vital Information Will Undermine Our War Effort. Do Your Part in Silence'
url: https://propagandaarchive.org/collection/canada-beware-do-your-part-in-silence-1940/
description: A large, shadowed, scowling face with a hand cupped behind its ear looms over three smiling servicemen, one holding a glass, who talk unaware.
section: Collection
---

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[![Beware: Spreading Vital Information Will Undermine Our War Effort. Do Your Part in Silence, 1940 Canada poster: A large](https://propagandaarchive.org/collection/images/canada-beware-do-your-part-in-silence-1940.jpg)](https://propagandaarchive.org/collection/images/canada-beware-do-your-part-in-silence-1940.jpg)

# Beware: Spreading Vital Information Will Undermine Our War Effort. Do Your Part in Silence

A large, shadowed, scowling face with a hand cupped behind its ear looms over three smiling servicemen, one holding a glass, who talk unaware. The tell is the oversized listener behind ordinary men, which attaches the danger of enemy ears to casual conversation.

## Propaganda techniques used in this poster

[Fear appeal](https://propagandaarchive.org/techniques/fear-appeal/)

## Text on the object

Original (English) · read from the image, not independently checked

```
BEWARE

SPREADING VITAL INFORMATION
WILL UNDERMINE OUR WAR EFFORT
DO YOUR PART IN
SILENCE

ISSUED BY THE DIRECTOR OF PUBLIC INFORMATION, OTTAWA. UNDER THE AUTHORITY OF THE MINISTER OF NATIONAL WAR SERVICES.
PRINTED IN CANADA

G.F. OF CENTRAL OUTDOOR ADVERTISING CO,
```

[← With Your Help We'll Beat This in the North Atlantic](https://propagandaarchive.org/collection/canada-beat-this-in-the-north-atlantic-1940/) [Careless Talk Brings Tragedy in Wartime →](https://propagandaarchive.org/collection/canada-careless-talk-brings-tragedy-jameson-1940/)

## More propaganda examples that use the same techniques

- [Miniature of Pope Urban II at the Council of Clermont, Les Passages d'outremer (BnF Fr. 5594, fol. 19r)](https://propagandaarchive.org/collection/passages-doutremer-council-of-clermont-colombe-1474/) (France · 1474 · Testimonial, Fear appeal). Content note: Medieval religious imagery and a French text describing alleged killings and captivity of eastern Christians, as used to argue for the First Crusade; the text is shown as written.
- [Anacoana fut pendue sans raison (engraving in Le miroir de la cruelle et horrible tyrannie espagnole)](https://propagandaarchive.org/collection/anacoana-hanged-miroir-tyrannie-espagnole-1620/) (Dutch Republic · 1620 · Fear appeal, Name-calling). Content note: Engraving of a hanged, bare-breasted Taino woman, burning huts and people being killed by Spanish soldiers.
- [Der Warner (broadsheet lampoon on the Jesuits after Breitenfeld and Rain)](https://propagandaarchive.org/collection/der-warner-anti-jesuit-broadsheet-1632/) (Holy Roman Empire · 1632 · Scapegoating, Fear appeal)
- [Sans-Culottes, feeding Europe with the Bread of Liberty (James Gillray)](https://propagandaarchive.org/collection/sans-culottes-bread-of-liberty-gillray-1793/) (Kingdom of Great Britain · Jan 12, 1793 · Fear appeal, Name-calling)
- [Proclamation de Sonthonax en créole, Cap-Français (Proclamation of Commissioner Sonthonax in Creole)](https://propagandaarchive.org/collection/sonthonax-proclamation-creole-1793/) (France · Aug 29, 1793 · Fear appeal, Scapegoating). Content note: Colonial-era proclamation on slavery and emancipation in Saint-Domingue; speaks of slaves, whips and 'Nègues' in period terms.
- [Gazette of the United States, "The Jeffersoniad" no. VIII, 14 August 1800](https://propagandaarchive.org/collection/gazette-us-jeffersoniad-1800/) (United States · Aug 14, 1800 · Name-calling, Fear appeal)
- [Tyrants Prostrate, Liberty Triumphant (pro-Polk cartoon on Dorr), 1844](https://propagandaarchive.org/collection/tyrants-prostrate-liberty-triumphant-polk-1844/) (United States · 1844 · Name-calling, Fear appeal). Content note: Speech balloons contain anti-Catholic and nativist wording ('the ruins of Popery') in the mouths of the Whig figures, written by a Democratic cartoonist and shown unaltered.
- [Brolej Žemajčiaj! (Brothers Samogitians!): hand-painted broken-cross poster](https://propagandaarchive.org/collection/brolej-zemajciaj-broken-cross-1862/) (Russian Empire · 1862 · Fear appeal, Transfer)