(CNN) -- Peter Benenson, the founder of the trailblazing human rights group Amnesty International, has died, the group has announced. Benenson, who was 83, started the human rights group in 1961. He died Friday night. At first, the group was started "a one-year campaign for the release of six prisoners of conscience," according to a news released on the Amnesty Web site. Benenson had been a lawyer at the time. It started in a May 28, 1961 Observer article called "The Forgotten Prisoners." "That appeal attracted thousands of supporters, and started a worldwide human rights movement. "The catalyst for the...