I am looking for a name referring to a rhetoric/propaganda tactic in which words are paired together to change perceptions? For example, if I said, "a controversial speaker is giving a lecture at a campus", the word 'controversial' is being paired with 'speaker' to alter how you think of the speaker(whether it's true or not). Or if I described a substance as toxic, I'm pairing toxicity with the substance.
I'm not sure those examples are the best examples, but I often see this in political propaganda. Where, I see, particular words, damaging words, being directly attached or in close proximity to the name of an individual or group. Words like "far-right extremist/far-left extremist", "socialist/fascist", or any other negative connotation. It's linking a damaging word with a target word or name that you want to tarnish.
I would like to know if there's a name to this Rhetorical tactic. Please, no debating about these politics, I just want to know the name of this Rhetorical tactic. I know it's similar to an association fallacy, but it appears more specific to rhetoric.