Prominent examples of external organizations that challenged the PAP during the 1987 ISA arrests are the International Commission of Jurists (ICJ), Amnesty International, World Council of Churches and Asia Watch.
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Cheng's role was to use the Catholic church in Singapore as a "ready cover" to organise the infiltration of disparate groups of influence including the Law Society, the opposition Workers' Party and various student bodies.
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They engaged Anthony Lester and Geoffrey Robertson, Queen's Counsels (QC) from Britain, to apply to the High Court for writs of habeas corpus, a legal action that requires a person under arrest to be brought before a judge to challenge detention lacking sufficient cause or evidence.
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