Antigone's "crime" is that she has insisted on burying her brother Polynices, as ordained by the law of the gods, despite the decree that the king Creon has issued that no one should bury Polynices because he is a traitor.
Throughout the play, Antigone has represented loyalty to the traditional, god-given values that require females to bury the dead of their families. Creon has represented the man-made value of respecting the state and punishing traitors.
Just before her death, however, Antigone seems to question whether it has been worthwhile to follow the dictates of the gods:
Which of the gods' laws have I transgressed?(930)
Why should I still look to the gods in my
unhappiness? What ally can I call?
In my case, by being pious, I have
won for myself the rewards of impiety.