Lists of common felonies and misdemeanors do not include any crimes specified using words with N. One possible answer is the generic term "narco-trafficking".
robbery
transgression
Nuts or nectarines are crops that begin with the letter N.
larcenyloan sharkinglooting
Only the letter N.
Neighborly and nondiscriminatory are good words. They begin with the letter n.
Newscaster, nuclear engineer and nurse are professions. They begin with the letter N.
Nails, nickels, needles and nightsticks are round. They begin with the letter n.
Piracy is all I can think of :/
Kast, killing, krest
Neon green, neon red, and neon blue are colors that begin with the letter 'N'.