“Propaganda” is a non-count noun: These nouns don’t have a plural form, which means there is no such noun as “propagandas”. These nouns take a singular pronoun – “it” instead of “they”. These nouns take the third person singular form of the verb, which means we say “Propaganda is” not “Propoganda are.” These nouns go with singular pronouns – “it”, instead of “they”. Don’t use the articles “a” or “an” in front of these nouns. Don’t use “each” or “every” in front of these nouns. Don’t use any numbers or the word “numerous” with these nouns. Use “much” or “a lot of” instead of “many”. Use “little” instead of “few”. Use “less” instead of “fewer”. Use “some” instead of “several”. Use “amount” instead of “number”. If you want a count noun, say "piece of propaganda." or "example of propaganda."
Which is correct?