After the Second World War, some Displaced Persons became energetic memory activists. The aim was to identify and commemorate the murdered, to document and collect material about crimes. Memorialization was part of (re)creating a collective identity and important aspect of political agenda(s). Although Displaced Persons built hundreds of monuments, their activities are mostly forgotten. Often the sites were dismantled, their ‘cultural footprints’ erased, their stories silenced. Whereas research on Jewish Displaced Persons has been done, this is not the case for the ‘other’ displaced memory activists. Thus, the article focuses on Polish and Ukrainian perspectives. Bringing together migration and memory studies, the history of the Second World War and its aftermath, it sheds light on these so far ignored activists from Eastern Europe. Building on untapped sources from globally scattered diaspora and family archives, a strong focus is placed on self-perception and representation. This provides insight into their narratives and motivations.