For a long time there have been immigrants looking for better working conditions. This situation has worsened a lot due to severe humanitarian crises - Syria, Venezuela and Ukraine.
Thomas Schuermann, I am including these works, for your review:
Jahre, M., Kembro, J., Rezvanian, T., Ergun, O., Håpnes, S. J., & Berling, P. (2016). Integrating supply chains for emergencies and ongoing operations in UNHCR. Journal of Operations Management, 45, 57-72. https://biopen.bi.no/bi-xmlui/bitstream/handle/11250/2433002/Integrating%20supply%20chains%202016.pdf?sequence=1
Lindén, K., & Dahl, P. (2016). How to provide a humanitarian warehouse location model with data-An assessment of scenario creation and data availability at the United Nations High-Commissioner for Refugees (UNHCR). https://lup.lub.lu.se/luur/download?func=downloadFile&recordOId=8872168&fileOId=8872170