Baroness Castle of Blackburn, Barbara Castle, was the first and only woman to hold the position of Britain's First Secretary of State, and she was the longest-serving Member of Parliament in modern history.

Raised by socialist parents, she became a powerful figure in left wing politics; she championed the women who held a strike against the Ford plant in Dagenham, England in 1968 for equal pay. They effectively brought the company to its knees in an international work stoppage. Miranda Richardson, a longtime follower of Castle, plays her admirably in Nigel Cole's 'Made in Dagenham.'

Moviefone caught up with the 52-year-old at the Toronto Film Festival. Richardson opened up to us about sex as political power, bringing companies – and men -- to their knees, and the changing film landscape.