Winston meets Julia and they talk, but neither seems to have any fear of the police. Why?In Book 3, Chapter 6

To me, the answer here can be found by thinking about why
people should fear the police in the first place.  They need to be afraid if they are
doing something wrong -- something the police do not know about and would be angry if
they did know.  But now, those criteria don't apply.  Julia and Winston are no longer
doing anything wrong.

The police already know all about the
relationship that the two of them had before and so it is not news.  The two of them are
not renewing their relationship, either emotionally or physically, so there is no reason
that the police would be angry if they did know.

Overall,
both of the two have had their wills broken and they are no longer a danger to the
Party.  Given that, why should they fear the police?