(If this incident had happened in Yugoslavia, or something similar with unjust police harassment, would anyone have heard about it on the news? Of course not.)

Unless the EB was radically different from the rest of 1970s Earth, nothing.

In the US, pre-1980s kids knew not to take any kind of abuse to the police. At best they'd be gaslit or outed to their abuser (who was commonly family). For most of LEO history cops (who reflected society in general) were not there to protect kids. Perps certainly knew this.

Source: We kids talked to each other and figured out reality pretty fast.