seen." However, it provoked angry press and public comment before the exhibition opened. Four members of the Royal Academy – Craigie Aitchison, Gillian Ayres, Michael Sandle and John Ward – resigned in protest at its inclusion in the exhibition. The Metropolitan Police Clubs and Vice Unit visited the exhibition before it opened, but could not find sufficient evidence to bring a prosecution in respect of any of the exhibits under the Obscene Publications Act. Winnie Johnson (mother of Keith Bennett, one of Hindley's victims, whose body remains missing) asked for the portrait to be excluded from the exhibition to protect her feelings. She joined a protest group, Mothers Against Murder and Aggression, that picketed the show's first day on 18 September. The charity Kidscape accused the Royal Academy of "sick exploitation of dead children" in an effort to attract paying visitors to address its financial deficit. Windows at Burlington House, where the Academy is based, were smashed. The painting was vandalised twice, by two different artists – Peter Fisher and Jacques Rolé – on the opening day of the exhibition, 18 September 1997. Fisher had smuggled blue and red Indian ink into the exhibition, concealed inside two camera film cases; he threw the ink over the painting and smeared it in. After witnessing this, Rolé left the exhibition, returned with eggs bought nearby, and threw three or four at the painting before being stopped by an off-duty police officer. The painting was removed to be restored, and was rehung after two weeks behind a protective perspex screen. Security guards stood nearby while the exhibition was open to the public. Hindley wrote from prison to ask for her portrait to be removed from the exhibition, reasoning that such action was necessary because the work was "a sole disregard not only for the emotional pain and trauma that would inevitably be experienced by the families of the Moors victims but also the families of any child victim." Despite all the protests, the painting continued to hang at the exhibition. The exhibition drew approximately 300,000 visitors, significantly more than usual, but less than the 813,000 visitors attracted to the Royal Academy's Monet exhibition in 1999. The reaction to Harvey's painting in London has been compared to that received by Andy Warhol's 36-feet-square mural Thirteen Most Wanted Men, which comprised large copies of photographs from a "most wanted" booklet published by the New York