Red-baiting, also known as reductio ad Stalinum () and referred to as "red-tagging" in the Philippines, is an informal logical fallacy that intends to discredit the validity of a political opponent and the opponent's logical argument by accusing, denouncing, attacking, or persecuting the target individual or group as anarchist, communist, Marxist, socialist, Stalinist, or sympathetic towards these ideologies. The word "red" in the phrase refers to the color that traditionally symbolized left-wing politics worldwide since the 19th century. The word "baiting" refers to persecution, torment, or harassment as in baiting.