Final answer:
The Bolshevik Party slogan was 'Long live the Bolshevik Party, the Lenin-Stalin Party, the vanguard of the Soviet people forged in battle, the inspiration and organizer of our victories!' This slogan was used in propaganda posters during the Soviet era to promote the party's ideology and emphasize its role in leading the people to victory.
Step-by-step explanation:
The Bolshevik Party slogan was 'Long live the Bolshevik Party, the Lenin-Stalin Party, the vanguard of the Soviet people forged in battle, the inspiration and organizer of our victories!'. This slogan was used in various propaganda posters during the Soviet era, emphasizing the party's role in leading the people to victory and promoting the ideology of communism. For example, a poster by Vladislav Pravdin in 1950 featured this slogan along with images of Lenin and Stalin, as well as red banners symbolizing the party's power and protection.