We did hear of bad cops before cell phones.
In 1972, the Knapp Commission issued a report on police corruption that identified two types of dirty cops: the “meat-eaters” and the “grass-eaters.” Meat-eaters are officers who “aggressivel…
nypost.com
There are many links and stories about riots in the 60s. I remember those days because as a white kid living in black neighborhoods, I felt the black anger on by body probably every week or so. Many of the riots were triggered by police abuse of black people and it was a real problem.
Yes, there was police corruption before cell phones. The first cellular system turned on around 1985. Phones back then didn't have cameras. The first camera phones happened around 2000-is but cellular companies charged you a dollar a picture to get the images off your phone. So the modern handheld-supercomputer cellular phone we know today is about 12, maybe 14, years old.
Now, for the first time, people have the ability to watch the watchers, to police the police. It is a great day for liberty and civil rights. Anyone who treasures liberty should be defending recording police.