A famous doctor’s parents emigrated from Russia in the early 1900s before he was born but eventually became naturalized citizens after all their children were born. They also changed their last name to an English-sounding name. The doctor practiced medicine during the 1950s and 1960s. The doctor spoke and wrote seven different languages and was very involved in research and education in his field of study. As the doctor became sought after for educational seminars around the world, he was invited to Russia to speak. The doctor refused to go. What are the legal, cultural, and political issues that could have caused him to reach this decision?