The event was organised by the American Civil Liberties Union, PEN American Center and the Cooper Union.
Singh, a senior staff attorney for the ACLU Immigrants' Rights Project, has been fighting against cases of torture and prisoner abuse in United States prisons.
Singh was one of the fiercest critics of former United States President George W Bush and his administration for its alleged condoning of torture and other abuse of prisoners. She recently slammed the Barack Obama administration for its decision to block the court-ordered release of photographs of detainee abuse by US troops in Iraq, Afghanistan and several other prisons.
Image: Mohammed Jaffer/SnapsIndia
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