Refers to a coordinated operation to capture or round up people or animals, often by police or authorities.
The police conducted a roundup of gang members.
A simultaneous sweep of drug dealers made the news.
Compound of 狩り (kari, 'hunting') and 込み (komi, 'including' or 'putting in'), from the verb 狩り込む (karikomu, 'to round up'). The noun form refers to the act of rounding up or sweeping.