In June of 1968, following the assassinations of Martin Luther King, Jr., and Robert F. Kennedy, President Lyndon Johnson set up the National Commission on the Causes and Prevention of Violence. A task force made up of academics studied killings, attempted killings, and assaults on eighty-one state legislators, congressmen, senators, governors, and Presidents, dating back to 1835. Their findings presented a discordant medley: cases involving mentally disturbed people, extremists, and terrorists; political grievances that escalated; and one incident, in 1890, in which a journalist shot and killed a congressman who had been harassing him. Over all, attacks on politicians seemed to spike in times of social instability, such as during Reconstruction.
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Source: Cultures & Arts