Short on cash, ANM turned to theft, stealing an estimated $800,000 in goods during a series of warehouse robberies. They also bashed a left-wing anti-racist campaigner in a home invasion. A tip-off to the police led them to the location where ANM's stolen goods were being stored and the arrest of van Tongeren's associates, Willey and John van Blitterswyk. Willey turned informant and collected recordings of the group's leadership leading to their arrest in August 1989. Following the arrest, two other members of ANM suspected fellow member David Locke to be a police informant and lured him into a Park in the suburb of Gosnells where he was beaten with iron bars and his throat slit.