The police are now monitoring criminal/gang/drug 'activity' in the area.
There has been an increase in the city's (level of) economic 'activity'.
The instruments are used to detect volcanic 'activity' on the island.
(..) -Anarchists suspected in Strasbourg bombing. When did you start working for the postal service? That was you back there? A Shame your activities have landed you in the gutter. A curious parcel, Who's the intended recipient? Why don't we discuss that over dinner tonight? I'm free for lunch. (..)2011 Sherlock Holmes: A Game of Shadows
(..) I knew you in Paris. I was just telling Laszlo that... ...unfortunately, I'm not able to help him. The word has gone around. As leader of all illegal activities, I'm an influential and respected man. But it'd not be worth my life to do anything for Laszlo. You, however, are a different matter. (..)1942 Casablanca
(..) Of course, one must admit he has great courage. He's clever. Three times he slipped through our fingers. In Paris, he continued his activities. We intend not to let it happen again. Excuse me. Your business is politics, mine is running a saloon. Good evening, Mr. Blaine. You see, major? You have (..)1942 Casablanca