why did Marji's uncle Anoosh flee to Moscow as a young man?

Anoosh’s Uncle Fereydoon had stood up to the Shah and had proclaimed independence in the province of Azerbaijan. Fereydoon had become the minister of justice. Anoosh had similar political ideas as his uncle, but Anoosh’s father had remained loyal to the Shah. Anoosh had become Fereydoon’s secretary but one day he had come to work to find that the Shah’s soldiers had arrested Fereydoon. Anoosh had run away to his family’s home and had arrived at his parents’ doorstep half dead from his journey. His father had welcomed him back, but the Shah’s police had still been on his trail. Anoosh had learned that Fereydoon had given himself over the Shah instead of running away. Anoosh left and went to the U.S.S.R.