According to CASE Belarus estimates, in 2017 the number of Belarusian labour migrants in the EU was around 100,000 people, not that much for a 9.5 mln country. That figure

Vulnerability issues of people aged 50+ in Belarus
Documents such as the Treaty establishing the European Community and the European Union (EU) Charter of Fundamental Rights set out fundamental social objectives, such as the promotion of employment and social protection, and include principles such as freedom, equality, and solidarity, and the right to fair and just working conditions, as well as social security and social assistance and equality between men and women.
ENCON — Enhancing CSOs Contribution to Evidence-Based Policy Making for Vulnerable Groups (2017-2018)
CASE Belarus in cooperation with CASE (Poland), Institute of Economic Research of Slovak Academy of Sciences (Slovakia), The Faculty of Economics and Administration of Masaryk University (Czech Republic), as well as ACT (Belarus) starts a project to enhance evidence-based policy towards vulnerable groups in Belarus.
Orphans in Belarus: fighting negative effects for beneficiary groups (2013-2014)
CASE Belarus together with SOS Children’s Villages Belarus has successfully accomplished a two-year policy oriented project aimed at evaluation of national programs towards orphans in Belarus.