The phrase "unlawful activity" refers to actions or behaviors that are against the law, or not permitted by society. It means doing something that is illegal or not allowed. Full definition
The court agreed that the property was used as an instrument of unlawful activity. (slaw.ca)
Meanwhile, a media report revealed the participation of the leading adviser of the upcoming ICO in unlawful activities in the past. (coinfox.info)
Also, these individuals may have to pay substantial fines that they can not afford and will likely be pushed to engage in other unlawful activities in order to survive. (slaw.ca)