This thesis explores how the tactics of intimidation, harrassment and criminalization impact the activists providing humanitarian assistance to migrants at the border between Poland and Belarus. Through an investigation of the relations of power between the authorities, the activists and the migrants, this study aims to understand the complex context of the border in which the activists provide the assistance. With the aim of exploring how the activists operate under the threat of criminalization, it makes a contribution to the emerging body of research on the phenomenon of criminalization of grass-roots humanitarian efforts, which has been on the rise in Europe and around the world. The findings reveal that as a result of the state imposed measures, such as heavy militarization and policing of the broder, as well as restrictions on freedom of movement and public access to information, the humanitarian aid is provided in an atmosphere of fear. Nevertheless, the desired effect of deterrence is not achieved, as the activists perceive providing aid as their duty.