Andrei Sakharov
The bomb he had helped make started Sakharov to be a dissident. He argued with Nikita Khrushchev against unneeded nuclear tests.  He was afraid that these tests put people's lives and healths in danger without need. He began asking, too, for more freedom of speech.  The government removed him from his secret work and his special job as a scientist. Sakharov began to see what unhappy lives most Soviet citizens led.