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J.J. Abrams, Debbie Allen, Judd Apatow, Julianne Moore, Mark Ruffalo and more signed the open letter

There is also a call to action for more Hollywood creators to sign.

"Stranger Things" issued a warning of "graphic violence" ahead of its premiere episode last month

pledged the earnings of his show in Buffalo on June 5 to the families of the grocery store shooting victim