The Democrat party platform for Bill Clinton's second term was tough on crime, drugs and illegal immigrants. You almost can't tell it from Trump's 2016 campaign. And you actually can see the drop in violent crime rates from 1993 through today--so funding more police, stiff prison sentences and stopping crime at the base actually did work. Mandatory sentencing, zero tolerance, etc. That Democrat policy particularly benefitted black neighborhoods which were the primary victims. But that also put more black criminals in jail (rate is 8x that of white violent crime), which now Democrats are calling racism (without looking at their own party's policies). The Democrats' campaign to stop illegal immigrants with tougher border policing and monitoring employers (it was the law) didn't seem to be as successful as decreasing violent crime and putting drug sellers in jail.
Liberals (of today) blame the tough on crime movement on Republicans, but they in fact, were not strong enough to implement it because with Democrats and President Clinton behind it, Republicans went along.