The main way we control crime in the United States is to identify career criminals and imprison them for long periods of time. The "three strikes" laws which essentially locked up more or less permanently persons convicted of a third felony were a major step in this direction.
A disproportionate share of persons who were locked up for long periods were Black. Wrongly claimed to be discrimination, this was actually because a disproportionate share of those committing repeat felonies were Black.
The Daily Caller has an interview with former New York City police commissioner Bill Bratton who makes some pointed observations regarding the surge in crime.
My own belief ... is that the crime surge in America right how has been politically created, and in cities where it’s occurring most dramatically, [sic] are those cities that ... have elected district attorneys, prosecutors who are embracing the criminal justice reform movement, bail reform, if you will.
You cannot point out one city in America that has one of these criminal justice reform district attorneys where crime is going down.
"Bail reform" DAs often won't charge criminals, or release them without bail. Not locked up, they end up back on the street, and predictably commit more felonies.
Most of the so-called "reform DAs" have received campaign donations from organizations connected to philanthropist George Soros, who may bear ultimate responsibility for much of the rise in crime. Having vast wealth, he doesn't live where the crime happens.