"Propaganda" is a loaded word, as it immediately reminds us of authoritative regimes and totalitarianism, but its definition, according to Merriam-Webster is:

- The spreading of ideas, information, or rumor for the purpose of helping or injuring an institution, a cause, or a person

- Ideas, facts, or allegations spread deliberately to further one's cause or to damage an opposing cause; also : a public action having such an effect.

Is what think-tanks do any different ? Mind, it's different from what normal press/media do, as their goal is usually financial and they just cater to their audience.