The sign likely would have stated "THEY'VE MESSED WITH THE WRONG GENERATION" on the front side, but many of the letters have fallen off since. The letters are cut out from magazines and/or newspapers. On the backside the lettering is in black and you also see that the sentence is supposedly not complete.
the letters in the front are made from magazine and/or newspaper cutouts. there are letters missing which makes the supposed statement more speculative. On the back side the lettering is in black and you also see that the sentence is supposedly not complete
10/6/2020 #BLM The E MESSED WIT l HE WRONG =NER I N
YOUR SILENC IS CO
Date, Bijlmer, Hashtag, Abbreviation,
Emanuel Oladokun, Camille Parker, Richard Weaver, Basil Barrett, Lieke Bremer
“BLM Sign,” The Black Archives, accessed October 17, 2021, https://collection.theblackarchives.nl/items/show/711.