Severely repressive actions.
When you enforce rules and laws more than you enforced them before, this is a crackdown.

ETYM Icel. reith a riding, raid; akin to Eng. road. Related to Road a way.
1. An attempt by speculators to defraud investors; SYN. mulcting.
2. The act of mulcting public money.
3. An attempt by professional operators to depress stock prices by concerted selling.

1. A summary list; as in e.g.
2. The activity of gather livestock together so that they can be counted or branded or sold.