 Complete the following phrase:  In 1919, at the age of twenty, Beria started his career in state security when the security service of the Azerbaijan Democratic Republic hired him while he was still a student at the Polytechnicum. In 1920 or 1921 accounts vary Beria joined the Cheka, the original Bolshevik secret police. At that time, a Bolshevik revolt took place in the Menshevik-controlled Democratic Republic of Georgia, and the Red Army subsequently 