Task: Text Categorization
Input (English): Putting forth an ideology called the "Anka Doctrine," a form of Maoism, this ruler would ascend to the rule of his power with the arrest of secretary Ton Samouth. Later during his rule, he decided to murder those who associated with Sak Sutsakhan to force him to surrender. He rebelled against the rule of Lon Nol, and his followers captured Phnom Penh several years later and renamed the country Democratic Kampuchea; places where those killed by followers of this leader were buried were called the "Killing Fields. " FTP, name this Communist leader from Cambodia who led the Khmer Rouge.
Output (English): History