 Voight actively protested against the Vietnam War.In the 1970s, he made public appearances alongside Jane Fonda and Leonard Bernstein in support of the leftist Unidad Popular group in Chile.In a July 28, 2008 op-ed in "The Washington Times," he wrote that he regretted his youthful anti-war activism, and claimed that the peace movement of that time was driven by "Marxist propaganda".