Cracking down on extremist elements.

We are cracking down on organized crime.

The league is cracking down on gold.

The government's cracking down on the workers. (clears throat)

Accordingly, safeguarding human rights must involve cracking down on terrorism.

Mr. Putnam, we're really gonna crack down on her homework.

- The country's really cracking down. ...two... ...one.

They're cracking down now on overdue books.

Since McCluskey's killing, the police have cracked down on our operations.

Fifth: comprehensive and coordinated measures to crack down on illegal border crossing activities.