Once the Young Turk Leadership decided action had to be taken against the Armenians, what actions did they take against the Armenian men?

Armenian Genocide

Explanation:

They had a  campaign of deportation and mass killing conducted against the Armenian subjects of the Ottoman Empire by the Young Turk government during World War I (1914–18). Armenians later claimed that the campaign was a deliberate attempt to destroy the Armenian people and, thus, an act of genocide.