"A smear is among the simplest of propaganda techniques. It can take the form of repeated, unapologetic, systematic name-calling, or otherwise implying or asserting that opponents are bad, evil, stupid, untrustworthy, guilty of reprehensible acts, or part of some undesirable category.
A smear might be conducted subtly or vaguely so the target cannot seek legal action against a slander or libel, which must be specific and believable to be legally actionable. False implications can be masked by otherwise truthful statements."