Times where somebody is accused of being a Category Traitor in Literature.
- Animorphs: Aldrea-Iskillion-Falan was an Andalite who willingly allowed herself to be trapped in Hork-Bajir morph, much to the horror of the Andalites who heard her (likely edited to prevent the Andalite military from looking bad) story. In her narration, Aldrea notes that her name is now synonymous with Category Traitor in the Andalite language.
- Dora Wilk Series:
- Joshua is considered this by his peers, as he's an angel who keeps company of devil and witch. While his grandfather (his only family) seems only a little distressed by the fact, Archangel Raphael's faction tries to murder him a few times, as Raphael is a Fantastic Racist.
- Dora gets her share of it as well, being a witch who keeps company of devil and angel (magicals and Christians have a long history of wars, the latest of which was barely three hundred years ago — not a long time for such a long-living folk). It's weaker than in Joshua's case, though.
- Subverted in the case of Miron, the devil part of the Trio. Hellians find his choice of company a bit weird, but generally don't mind.
- In Margaret Coel's The Eagle Catcher, a woman accuses Father John of being "White on the outside, Indian on the inside" because he didn't (even try to) talk her daughter out of marrying an Arapaho.
- Frederick Douglass's first autobiography, Narrative of the Life of Frederick Douglass, recalls an incident he witnessed in the North after his escape from slavery where a freeborn black man got in a fight with an escaped slave and threatened to sell his whereabouts to slave catchers. The rest of the local black community ran the freeborn man out of town for this; Douglass is sure he would be lynched if he ever returned.
- In the Godzilla vs. Kong novelization, IshirÅ Serizawa's own son Ren views him as a traitor to humanity who cares more about Godzilla than he does about human life, because of his Parental Neglect towards Ren and his "let them fight" stance on the Titans.
- Harry Potter:
- The Death-Eaters consider wizardry to be in the blood.note They also feel that all "real" wizards are obliged to be "loyal" to "their own kind," and thus despise Muggles, as well as wizards with direct Muggle ancestry (who are derisively termed "mudbloods"). Wizards who are from pureblood backgrounds but don't hate Muggles and Muggle-born wizards, they refer to as "Blood Traitors." By the standards of particularly supremacist families like the Blacks, Blood Traitors are considered just as disgraceful as Muggles and Muggle-borns; Arthur Weasley's mother, Cedrella Black, had her name burned off of the family tapestry because she dared to marry Septimus Weasley, even though he was a pure-blood, thus putting her on the same footing as her great aunt Iola Black (who married a Muggle) and first cousin twice removed Andromeda Black (who married a Muggle-born wizard).
- In this case, the trope is actually eating itself; Arthur Weasley and Sirius Black both point out that thanks to blood purism and the overall low wizard population, pureblooded wizards are nearly all related and any attempt to maintain blood purity is doomed in the long (or even short) term. Also a matter of hypocrisy; the Death Eaters almost all have Muggle relatives because, as noted above, the wizard population is simply too small for it not to be the case. These inconvenient branches of the family tree are often stricken from the record. Voldemort himself has a Muggle father, though Death Eaters who know this are either smart enough to not bring it up, or not going to be alive very long.
- In an interesting look at things, even wizards who aren't Death Eaters have negative opinions on wizards who are a little too interested in Muggle affairs. Arthur Weasley is implied to be passed up for promotions (and thus means by which to better provide for his family) because of his unnerving enthusiasm for anything Muggle-related, which even the Minister of Magic sees as disgraceful. Dumbledore also gets some grief for reading Muggle newspapers.
- Molly Weasley has a second cousin who's an accountant, but the family "never talks about him." Mentioned early in the first book, this was originally going to be followed up with a long plot arc where the accountant had a daughter who was a witch but didn't end up in the books so it's unclear exactly why they never talk about him. Word of God says this was because he was rude to the Weasleys in the past
- In Order of the Phoenix it's revealed that the centaur herd living in the Forbidden Forest view any of their fellows deigning to work for wizards, and especially teaching them how to read the stars, is considered treachery to be punished by a painful execution by being kicked to death. Luckily Hagrid was able to save Firenze but only after they had already begun.
- John Grammaticus and Damon Prytanis, two human Perpetuals in the Horus Heresy series of Warhammer 40,000 novels, act as undercover agents for the sinister alien Cabal and are under no illusions that they are traitors to their own species for doing so. The Cabal's agenda appears to be the complete destruction of the human species as a way of saving the galaxy from the encroachment of Chaos. Damon is somewhat amoral and accepts his lot quite peacefully, but John has severe doubts about his species treachery and constantly seeks ways to get out of the situation he has found himself in.
- Huckleberry Finn's father (an uneducated, coarse slob) berated his son for taking up reading and doing quite well, because all their family were illiterate prior to that moment. He even goes so far as outright calling his son a traitor.
- An Evil Poacher (who has kidnapped several gorgon children) accuses Alex Price of this in the InCryptid novella The Measure of a Monster.Poacher: Wait, Alex? Alex Price. What the fuck man? I thought your people were on humanity's side.
Alex: We're conservationists. The human race is currently of least concern. Now give me the keys, before I make you extinct. - In Ellison's Invisible Man, Lucius Brockway accuses the narrator of being a traitor to him and Liberty Paints when he walks out of a union meeting. The Narrator, a young man who just wants to get by, wanted nothing to do with the company's politics and stumbled into the union meeting by accident. It takes the Narrator literally beating some sense into Lucius to convince him otherwise.
- The Known World: Augustus Townsend, freed slave, is horrified to be told that his son Henry, himself a freed slave, has begun buying slaves. Augustus says he vowed never to have a slave owner in his home, and throws Henry out of the house.
- Market of Monsters takes place in a world occupied by regular humans and "unnaturals" (vampires, kelpies, ghouls, Unscaled Merfolk, and the like). There's a booming illegal trade in unnaturals and their flesh, blood, and body parts and plenty of the ones doing the kidnapping, murdering, and selling are unnaturals themselves, such as the heroine's mother and her buyer Boulder.
- Reign of the Seven Spellblades: Kimberly's rival school, Featherston Sorcery School, is vocal in its support for demihuman rights, whereas Kimberly broadly speaking tends to view magical creatures as fodder for experiments. Some Featherston students the Sword Roses encounter in volume 4 accuse Katie of betraying the movement by attending Kimberly, which sets off a Bar Brawl despite Oliver and Chela's efforts to defuse the situation. For her part, Katie counters that she wouldn't experience any personal growth if she was surrounded only by people who already agreed with her: she wants her viewpoints to challenge others and be challenged.
- The Silerian Trilogy: Betraying your own people is viewed as the worst thing any Silerian can do, and they punish it with death by slow torture.
- In Spock's World, McCoy calls a Vulcan writer and eventually all of them out on violating the teachings of their planetary hero, Surak.
- In Survivor Dogs, Axe calls Lick a "traitor to her own kind" because she's siding with dogs who aren't Dobermans.
- Brett in The Truth of Rock And Roll considers Johnny to be this for dating a girl from the trailer park and treating her too well. Using her for sex would have been okay, but treating her like she's "as good as us" (they're both from "the Heights", a rich part of town) might give her ideas "above her station."
- The Turner Diaries is built on this trope: the base premise is that being white without being a racist is a crime, the Moral Event Horizon of "betraying" your race. Considering that the book was written by a Neo-Nazi...yeah.
- In Warrior Cats, the cats are very proud of their Clan, and in general of the Clans' warrior lifestyle. Speaking out against taking excessive action against another Clan/cat, or sometimes even talking in a friendly manner to non-Clan cats can result in accusations of being a traitor. Rejecting any part of the Clans' lifestyle (such as keeping your given name instead of taking on a Clan name when joining them) also is looked upon with suspicion.
