In the crackdown following the events of May 1937 she assisted the escape of anarchists wanted by the Communist secret police and smuggled into prison letters and food for fellow anarchists held by regional authorities.
Ethel Merman | Ramsay MacDonald | Jeanette MacDonald | Ross Macdonald | John A. Macdonald | Ethel Waters | Norm Macdonald | George MacDonald Fraser | George MacDonald | Malcolm MacDonald | Ann-Marie MacDonald | Amy Macdonald | Macdonald | Julius and Ethel Rosenberg | Harold Scott MacDonald Coxeter | Todd MacDonald | Malcolm Macdonald | Macdonald Carey | J. E. H. MacDonald | Heidi MacDonald | Ethel Wilson Fiction Prize | Ethel (string quartet) | Ethel Booba | Catriona MacDonald | Angus MacDonald, 8th of Dunnyveg | Sir James MacDonald, 9th of Dunnyveg | Margaret MacDonald (artist) | MacDonald sisters | MacDonald of Glencoe | Kenneth MacDonald |
For many years, Caldwell shared with Ethel MacDonald a third-floor flat in Gibson Street, Hillhead, Glasgow.