Samantha Smith wrote a letter to the leader of the Soviet Union. When he didn't answer, she contacted their embassy - and then went to Russia on a mission for peace. President Reagan probably watched Samantha's first interview on Nightline (4 minutes):
In 1981 more than 1 million people were rallying in the streets of Europe. In June 1982, 1 million gathered in New York City for an anti-nuclear protest . In October 1983, nearly 3 million people across western Europe protested nuclear missile deployments and demanded an end to the arms race; the largest crowd of almost 1 million people assembled in the Hague in the Netherlands. 4 minute clip from "Taking on the bomb" - how a few ladies with babies started a movement that millions decided to join: https://youtu.be/x9NSzEUSX5s
In the United States the right to petition is guaranteed by the First Amendment to the United States Constitution, which specifically prohibits Congress from abridging "the right of the people...to petition the Government for a redress of grievances". Exercise democracy - contact your elected officials today!