Question: What post-World War II militant movement was Clark Reid Martell known for?
Sentence (from "Clark Martell"): Clark Reid Martell (born December 23, 1960) is an American white supremacist, the former leader of Chicago Area SkinHeads (CASH), which was founded by six skinheads under his leadership in year 1987 the first organized neo-Nazi white power skinhead group in the United States.
Relevant evidence: Yes