Propaganda posters had great importance especially before media became effective as today. People shared historical propaganda posters on a Reddit page and here are 30 of them.
Here are propaganda posters from WW2.
1. A Known Classic That Never Seems To Age. Date Unknown (1920s?)
2. Help Keep Your School All American! 
3. We Don’t Always March Straight, Swedish Armed Forces Gay Pride Poster, 2018
4. Barbarity vs. Civilisation, By René Georges Hermann-Paul, 1899
5. Anti-Vac Comic From The 1940s. Stupidity Is Timeless.
6. Poster Distributed By Youthbuilders, The Student Group From New York City’s Ps 43, To Protest Segregated Blood Banks, Produced In 1945.
7. Anti-American Poster, Ussr, 1960
8. Dc Statehood Poster (2006)