can anyone help me, I'm trying to create a thread on public opinion due to media/gov't propaganda and how it influences common opinion , i know there's a name for it to expose how we're being corrupted by propaganda but for the life of me I can't recall the name of the basis for that its the graph which shows how people get caught up in what they think is popular opinion, please help!

can anyone help me, I'm trying to create a thread on public opinion due to media/gov't propaganda and how it influences common opinion , i know there's a name for it to expose how we're being corrupted by propaganda but for the life of me I can't recall the name of the basis for that its the graph which shows how people get caught up in what they think is popular opinion, please help!