In 1994, the US federal government adopted the Violent Crime Control and Law Enforcement Act (signed into law Sept. 13, 1994).
Ben Shapiro, host of the 'Daily Wire' podcast on YouTube, referred to it recently, saying:
The 1994 crime bill... it brought down crime...
The only thing the Wikipedia page says about crime reduction is in reference to the Community Oriented Policing Services (COPS) Office:
... it has been acknowledged that the COPS Office had at least a modest impact in maintaining a long period of reduction in crime that had begun in 1992, but the primary reasons for this reduction remain a topic of debate.
but the COPS provision is about funding assistance for hiring local-community police officers, which is a more benign part of the bill, not one of those parts that are widely panned today.
Also, a decrease in crime is a trend than can have multiple contributing causes other than high-level-legislated policing, trial, sentencing and incarceration policy. And there's the question of what constitutes "crime": De/criminalization of certain behaviors increases or reduces crime rates. Even without that happening, if 10 more people get murdered each year, but 20 less people are beaten up; is there "less crime"? If 5 more banks are robbed for $1 million each while 1000 less stores are robbed for $5,000 each, is there less crime?
So, my question is: What parts, if any, of the Public Law are known to have "reduced crime" significantly, and under what definition and measure of crime?