Mahler returned to Manchester in 1937 but during 1940 he was interned as "an enemy alien" for 3 months and spent some time in the same camp on the Isle of Man as Kurt Hirsch .
Mahler ibabalik sa Manchester sa 1937 ngunit sa panahon ng 1940 siya ay interned bilang "kaaway ng isang dayuhan" para sa 3 buwan at ilang oras na ginugol sa parehong kampo sa Isle of Man bilang Kurt Hirsch.