"To comrades who are happy about Dinko I will say that if society slides down that same road, one day people like him will persecute socialists in the streets as the nation's enemies, while others will applaud. It isn't something that has never happened."

Bulgaria's former Foreign Minister Kristian Vigenin warning against any support among members of his Bulgarian Socialist Party (BSP) for "migrant hunters" like Dinko Valev, a man from Southern Bulgaria who takes pride in detaining migrants "with his bare hands" and whose actions were initially praised by authorities.

However, a recent video showing citizen's arrests by a volunteer border patrol group has pushed border police to criticize the detentions.