Question:  Robert "Bobby" DeLaughter is a prosecutor, judge, and author notable for prosecuting and securing the conviction of a white supremacist and Klansman who was convicted of assassinating what civil rights leader?   
Sentence (from "Paul Fromm (white supremacist)"): Frederick Paul Fromm (born January 3, 1949), known as Paul Fromm, is a Canadian white supremacist and perennial candidate based in Mississauga, Ontario.
Relevant evidence: No