In response to AMAC, the New Zealand Parliament passed Labour MP and SPUC member's Gerard Wall's Hospitals Amendment Act 1975 which limited the provision of abortion services to licensed hospitals. While AMAC was forced to close, it later reopened in 1980 after buying a private hospital. The Hospitals Amendment Act was later invalidated on technical grounds. In response to the closure of AMAC, abortion rights activists established the Sisters Overseas Service (SOS), which helped women travel to Australia for abortion operations in 1978 and 1979. McCulloch estimates that SOS chapters across New Zealand including Auckland and Wellington sent between 4,000 and 4,500 women to Australia for abortion operations during that period. National Party MP Frank Gill later tried to entrench Wall's bill through the Health Amendment Bill 1976 but pro-abortion rights National MP George Gair managed to pass an amendment deferring it by twelve months.