Over 400 celebrities signed the ACLU letter in support of Kimmel & the right to free speech (123 of them listed here)

Adam Scott Alan Cumming Alfred Molina Al Yankovic Alyssa Milano Amber Tamblyn America Ferrera Ana Gasteyer Annette Bening Annette O'Toole Anthony Anderson Barry Levinson Ben Platt Ben Stiller Billy Crystal Billy Eichner Brad Hall Bradley Whitford Bryan Cranston Busy Philipps Camryn Manheim Cecily Strong Chazz Palminteri Chelsea Handler Christina Applegate Christine Baranski Christine Lahti Christine Taylor Claire Danes Cyndi Lauper Cynthia Nixon David Arquette Debbie Gibson Debra Messing Diego Luna Edie Falco Elizabeth Banks Eric Bogosian Florence Pugh Frances Fisher Frances McDormand Gabriel Luna George Takei Gina Gershon Gloria Steinem Griffin Dunne Hank Azaria Harvey Keitel Jamie Lee Curtis Jane Fonda Jane Krakowski Jason Alexander Jason Bateman & Amanda Anka Jean Smart Jennifer Aniston Jesse Tyler Ferguson Jill Eikenberry Jim Parsons Joel Coen Jon Cryer Josh Hamilton Josh Radnor Judd Apatow Judy Gold Julia Louis-Dreyfus June Squibb Justin Theroux Kerry Washington Kevin Bacon Kirsten Dunst Kristen Johnston Kristin Davis Kyra Sedgwick Lake Bell Laura Linney Lena Dunham Lin-Manuel Miranda Maggie Gyllenhaal Marcia Cross Mark Ruffalo Martha Plimpton Martin Short Mary-Louise Parker Maya Rudolph Melissa Gilbert Melissa Villaseñor Meryl Streep Michael Keaton Michael McKean Molly Ringwald Naomi Watts & Billy Crudup Natalie Portman Nathan Lane Noah Wyle Olivia Rodrigo Parker Posey Patricia Clarkson Patton Oswalt Pedro Pascal Punkie Johnson Rachel Dratch Rainn Wilson Regina King Richard Kind Rob Morrow Robert DeNiro Rooney Mara & Joaquin Phoenix Rosario Dawson Rosie O'Donnell Rufus Wainwright Selena Gomez Sharon Stone Sheryl Crow T.R. Knight Taylor Tomlinson Tig Notaro Timothy Olyphant Tom Bergeron Tom Hanks Tony Goldwyn Uzo Aduba Wallace Shawn Zooey Deschanel