1. There is danger of a vicious circle if the Italian economy sags.

2. Police moved in on the protesters near a government building Wednesday morning, after three days of vicious street fighting.

3. Black Friday is popular, and its popularity feeds on itself in a vicious cycle.

4. We will not concede a single block or a street corner to your vicious tactics.

5. Even today, end users are easily fooled by this vicious type of malware.

6. But anger over the attacks has prompted vicious reprisals on Muslim civilians in other parts of the country.

7. Such steps by Congress could set off a vicious cycle in which Iranians feel they have to retaliate, and political support erodes.