clamp down
crack down

Because children like those, she could only crack down on them so hard.

China has made a great show of cracking down in the past few years.

But she'll think she had it easy, after I begin to crack down!

Before the government got involved and began to crack down on 900 lines.

And then he cracked down on them, taking away some of their benefits.

"So you think they really cracked down on our house?"

"Are you trying to crack down on people like us?"

The Chinese government is only now cracking down on the trade.

Most pressure is from people who want the government to crack down on crime.

It provided another reason for the Government to crack down.