Soviet safety posters
Almost all enterprises in the USSR, which carried out production, were in abundance hung with posters on safety precautions. Yes, not just posters, but very harsh illustrations that clearly demonstrated the sad outcome if safety precautions were not followed.
Many of them can easily be confused with posters for horror films, but the posters did their job: unequivocal appeals saved dozens and hundreds of workers from injuries and even death in the workplace. After all, a harsh illustration together with competent copyright will not leave anyone indifferent!