| 100% | ANON | 4 | Internet group whose identities are unknown |
| 63% | DOE | 3 | John ___ (man whose identity is unknown) |
| 60% | ANON | 4 | Someone whose identity is unknown, for short |
| 60% | ANON | 4 | One whose identity is unknown, for short |
| 59% | JOHNDOE | 7 | Name given to a male whose identity is unknown |
| 59% | JANEDOE | 7 | Name given to a female whose identity is unknown |
| 52% | ELISE | 5 | Beethoven title woman (whose identity is unknown) |
| 49% | ELENA | 5 | Author Ferrante whose true identity is unknown |
| 45% | SPY | 3 | Agent whose identity is usually classified |
| 45% | SPY | 3 | One whose identity is often classified |
| 44% | ANON | 4 | "Author's identity is unknown," for short |
| 44% | GRANDJURY | 9 | Group whose proceedings are sealed |
| 43% | ANONYMOUS | 9 | Like a blog commenter whose identity is secret |
| 43% | POSSE | 5 | Group whose work is picking up |
| 42% | USMC | 4 | Group whose motto is "Semper Fidelis": Abbr. |
| 42% | MENSA | 5 | Group whose second president was Buckminster Fuller |
| 42% | NFL | 3 | Group whose commissioner is Roger Goodell: Abbr. |
| 42% | ABBA | 4 | Group whose logo is a mirror ambigram |
| 42% | TALKINGHEADS | 12 | Group whose last album together was Naked |
| 42% | FDA | 3 | Group whose approval is often sought?: abbr. |
| 42% | BETH | 4 | Cop whose identity was assumed by Sarah on "Orphan Black" |
| 42% | PGATOUR | 7 | Group whose lies are much discussed on TV |
| 42% | ABBA | 4 | Group whose songs are featured in "Mamma Mia!" |
| 42% | THERASCALS | 10 | Group whose 1968 album "Time Peace" was #1 |
| 42% | ABBA | 4 | Group whose music is heard in "Mamma Mia!" |
| 42% | ABBA | 4 | Group whose music is featured in "Mamma Mia!" |
| 42% | ABBA | 4 | Group whose first U.S. hit was "Waterloo" |
| 42% | DEVO | 4 | Group whose signature hats were called energy domes |
| 42% | AMA | 3 | Group whose current president is an anesthesiologist: Abbr. |
| 41% | FANCLUB | 7 | Group whose members are dedicated celebrity followers: 2 wds. |