Answer: PLACARDS

AnswerCrossword Clue
PLACARDSSigns
PLACARDSSigns at a rally
PLACARDSPicket line boards
PLACARDSDemonstration signs
PLACARDSPicketing displays
PLACARDSBills.
PLACARDSPosters
PLACARDSShow bills
placardspublic sign or notice
placardsPLACARD, to publicise by means of posters