Each of these online chats alludes to a Supreme Court case in which Justice Felix Frankfurter wrote a signed opinion. In each case the party chatting with Frankfurter is presenting a simplified and colloquial version of something like the position or attitude of the petitioner in the case. @felix eventually gives a thumbs-up or thumbs-down emoji reaction, indicating whether Justice Frankfurter voted in support of or against that petitioner's legal position.
The cases are presented in chronological order and an emoji used by each petitioner helps to identify the petitioners for the clue extraction.
The petitioners and cases are
- 😈 @minersville (Minersville School Dist. v. Gobitis, 310 U.S. 586 (1940))
- 🎩 @unitedstates (mentions the respondent @pink) (United States v. Pink, 315 U.S. 203 (1942))
- 👩🏫 @westvirginiaboardofeducation (West Va. Board of Education v. Barnette, 319 U.S. 624 (1943))
- 📰 @marsh (Marsh v. Alabama, 326 U.S. 501 (1945))
- 💵 @unitedstates (mentions the respondent @lovett) (United States v. Lovett, 328 U.S. 303 (1946))
- 😱 @colegrove (Colegrove v. Green, 328 US 549 (1946))
- 🇺🇸 @adamson (Adamson v. California, 332 U.S. 46 (1947))
- 👺 @dennis (Dennis v. United States, 341 U.S. 494 (1951))
- 📽️ @burstyn (Joseph Burstyn, Inc. v. Wilson, 343 U.S. 495 (1952))
- 🏭 @youngstown (Youngstown Sheet & Tube Co. v. Sawyer, 343 U.S. 579 (1952))
- 🙊 @ullmann (Ullmann v. United States, 350 U.S. 422 (1956))
- 🏜️ @trop (Trop v. Dulles, 356 U.S. 86 (1958))
- 😦 @wiener (Wiener v. United States, 357 US 349 (1958))
- 🎉 @communistparty (Communist Party v. SACB, 367 U.S. 1 (1961))
Reading the numbered blanks in order then gives the clue USINCITATIONSISSHORTFOR ("U.S. in citations is short for"), and the answer is UNITED STATES REPORTS.