Poulos participated in Sonderkommando 2000, a German counter intelligence unit which aimed at infiltrating the Greek resistance movement. Poulos also worked for the National Union of Greece (EEE), an antisemitic party sponsored by the SS. He and his forces organised and committed many crimes in the rural areas of Greece; the most notorious was the attack on Giannitsa in September 1944, during which about a hundred peasants were executed. The aim of the executions was to instill terror into the supporters of the left-wing EAM/ELAS, as Giannitsa was considered an important resistance centre. However, Poulos and his men killed in an indiscriminate fashion and it is probable that most of the victims had little to do with the Resistance. In March 1945, Poulos and his unit were transferred to Austria, where they remained until the end of the war. In 1947, Colonel Poulos was convicted of treason and executed.