J. M. Gower, secretary of the Largs North Progress Association received anonymous phone calls threatening that Mrs Mangnoson would meet with an accident if he interfered while A. H. Curtis, the acting mayor of Port Adelaide, received three anonymous phone calls threatening "an accident" if he "stuck his nose into the Mangnoson affair". Police suspect the calls may be a hoax and the caller may be the same person who also terrorised a woman in a nearby suburb who had recently lost her husband in tragic circumstances.