To count violent crime, the FBI includes murder and nonnegligent manslaughter, forcible rape, robbery and aggravated assault. In 2002, that number was 31,137 in Massachusetts. In 2006, it was 28,775. That means violent crime declined 7.6 percent, just like Romney claims. Giuliani is wrong on this point.
But let's take a closer look at murders and robberies.
Murders went up from 173 in 2002 to 186 in 2006, for an increase of 7.5 percent. The murder rate — the number of people murdered per 100,000 people — moved up from 2.7 to 2.9.
Robberies increased more than murders. Robberies in Massachusetts increased from 7,169 to 8,047, a jump of 12.2 percent. The robbery rate increased from 111.5 to 125.
So what made the violent crime rate go down if murders and robberies went up? The biggest category decline under Romney was aggravated assault, which declined from 22,018 to 18,800, a drop of 14.6 percent.
Given these numbers, Giuliani is right when he says murders and robberies went up, but wrong when he says violent crime went up. We rate his claim Half True.