In the wake of the Kishinev pogrom, Adler went back briefly to Eastern Europe in summer 1903, where he tried to convince various family members to come to America. Although he was greeted as a hero, he was only partially successful in convincing people to leave; his mother, in particular, was determined to finish out her life where she was. (His father had died some years earlier.) He persuaded his sister Sarah Adler to follow him to America as her husband had died of heart disease in Verdun in 1897 and she was raising seven children on her own. She emigrated in 1905.