The most common and most likely answer to this crossword clue is the 8 letter word OFFENSES
I've seen this crossword clue in The Guardian
O
F
F
E
N
S
E
S
More clues leading to the result OFFENSES
Buddy explains!

The straight part
We know that "US crimes" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case us crimes = offenses.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does OFFENSES mean?
OFFENSES noun- The act of offending:
- The state of being offended or displeased; anger; displeasure.
- A strategy and tactics employed when in position to score; contrasted with defense.
- The portion of a team dedicated to scoring when in position to do so; contrasted with defense.