This is the 601st most frequent Ukrainian word.
злочини
"Crimes."
The word 'злочинів' is the genitive plural form of 'злочини', used here to quantify the 'level' of crimes in a descriptive manner.
Це місто має низький рівень злочинів.
This city has a low level of crimes.
Here, 'злочини' appears in the nominative plural form, acting as the direct object of the verb 'розслідує' (investigates).
Він розслідує найтяжчі злочини.
He investigates the most serious crimes.
The word 'злочинам' is used in the dative plural form, indicating the indirect object tied to the action of prevention.