He was a founding member of the Edmund Burke Society, established by Paul Fromm, Don Andrews, and Leigh Smith. He was also part of an attempted takeover by Fromm of the Ontario wing of the national Social Credit Party of Canada. Overfield appears to have run for office under the banner of the Social Credit Party in the riding of Beaches-Woodbine. Though he was expelled from the national party, he remained a member of the Ontario Social Credit Party, which had been taken over by the Edmund Burke Society in the early 1970s.