Milgram sent letters to a random selection of people in American cities, telling them that they were to pass the note to a certain stockbroker living in Boston if they knew him by name.

• 米尔格拉姆向随机选中的美国城市居民发送信件，告诉他们如果他们知道住在波士顿的某个股票经理人的话，就把信发给他。