Conversation so far:
where did tony benn retire from?
Several months prior to his retirement, Benn was a signatory to a letter.
when did he retire?
CANNOTANSWER.
what is a signatory?
CANNOTANSWER.
is there anything i should know in this article?
In the name of "protecting" women from trafficking, about 40 women, including a woman from Iraq, were arrested, detained.

Question: why were they arrested?
Self-contained rewrite: Why were 40 women arrested in the name of "protecting" women?