This is the 1538th most frequent Russian word.
преступлений
"Crimes" (genitive plural of "преступление").
Here, 'преступлений' is the genitive plural form of 'crime', used to denote multiple criminal acts.
Его обвинили в совершении нескольких преступлений.
He was accused of committing several crimes.
In this instance, 'преступлений' serves as the genitive plural to indicate a measurable quantity.
Количество преступлений в этом районе за последний год уменьшилось.
The number of crimes in this area has decreased over the past year.
'Преступлений' here is also in the genitive plural, used to express negation of any crime involvement.