When Iranian activist Masih Alinejad posted a picture of herself driving without a hijab, she had no idea what she was starting. Five years later, thousands of women have joined her movement against the mandatory hijab, and they have become a force for the Iranian government to reckon with. The BBC's Nassim Hatam has been following the story.
Image: Iranian woman with wind in hair, veil held aloft
Credit: mystealthyfreedom
