In 1984, what crime does the main character commit, how does he do it and what is the punishment?

The main character, Winton, commits a bunch of crimes.  He
has a sexual relationship with Julia.  He keeps a diary and writes "Down with Big
Brother" in it.  He seeks out an organization that supposedly exists to see the downfall
of Big Brother.  All of these are things are crimes against the ruling government;
however, all of the crimes are thematically the same.  Each crime is technically the
same crime, because each crime is technically a thoughtcrime.  Winston is doing all of
his rebellious acts, because he hates Big Brother and the government system that is in
place.  

His punishment is capture and torture.  The
torture is a combination of both physical and psychological.  That was a rough section
to read, because I'm not a fan of rats either.  

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‘You understand the construction of this cage.
The mask will fit over your head, leaving no exit. When I press this other lever, the
door of the cage will slide up. These starving brutes will shoot out of it like bullets.
Have you ever seen a rat leap through the air? They will leap on to your face and bore
straight into it. Sometimes they attack the eyes first. Sometimes they burrow through
the cheeks and devour the
tongue.’

The result of
Winton's torture was a complete brainwashing.  Winston goes back to functioning as an
automaton in complete support of Big Brother. 

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But it was all right, everything was all right,
the struggle was finished. He had won the victory over himself. He loved Big
Brother