"In and after 1964 when I began to concern myself with the biological issues, and particularly from 1967 onwards, the extent of the problems over which I felt uneasy increased to such a point that in 1968 I felt a compelling urge to make my views public."
Andrei Sakharov was a Soviet physicist and human rights advocate. He played a central role in the Soviet hydrogen bomb program and later became a prominent dissident and Nobel Peace Prize laureate.