I imagine they have some sort of evidence concerning their activities that they hold over their heads.

He greeted the questers as if he had heard nothing concerning the night's activities.

She appears to have a frank and open relationship with them concerning their criminal activities, of which she is happy to accept the benefits.

Volunteers will answer questions concerning the animals' nighttime activities.

We must now try to come to some conclusion concerning their present activities.

Additionally, God sits daily in judgment concerning a person's daily activities.

Some questions were asked concerning the day's activities.

He turned down several questions concerning his past activities on the Continent, saying they could affect 16 current libel actions.

"Questions have arisen concerning your recent activities that require an immediate explanation."