 Complete the following phrase:  In the modern world, the killing of important people began to become more than a tool in power struggles between rulers themselves and was also used for political symbolism, such as in the propaganda of the deed. In Stockholm, King Gustav III of Sweden was fatally shot at a masked ball on March 29, 1792. In Russia alone, two emperors, Paul I and his grandson Alexander II, were assassinated within 80 years. In the United Kingdom, only one Prime Minister has been 