In 1987, Tang was detained by the
Internal Security Department (ISD) during Operation Spectrum. She subsequently accused Officer SK Tan of assaulting her during her interrogation and
indefinite detention by the Internal Security Department. Her detention was speculated by many as a means to crush
political dissent. In a letter, She was subsequently wanted by the
Singapore Police Force (SPF) for breaching her terms with the ISD for her visit to Britain. On 8 October 2011, Tang, along with exiled political dissident
Francis Seow, publicly addressed a
Singapore Democratic Party (SDP) forum from abroad via teleconference. In the address they advocated abolishing the ISA. The SPF investigated the legality of the event the following day. == Personal life ==