Conversation so far:
What happened to Winnie Madikizela-Mandela during Apartheid?
Winnie Mandela emerged as a leading opponent of apartheid during the latter part of her husband's imprisonment.
And what else happened to Winnie Madikizela-Mandela ?
Due to Winnie Madikizela-Mandela's political activities, she was regularly detained by the National Party government.
What did Winnie Madikizela-Mandela do to fight Apartheid?
Campaigned actively for equal rights and was promoted by the ANC as a symbol of their struggle against apartheid.
Except what happened to Winnie Madikizela-Mandela?
While in exile in Brandfort, Winnie Madikizela-Mandela, and those who attempted to assist her, were harassed by the apartheid police.

Question: Why did she go to prison?
Self-contained rewrite: Why did Winnie Madikizela-Mandela go to prison?