I don't have access to the case details from here, but I'll look into it.
If it is prior to Wickard, it is not by much, and basically involves the same federal expansion of power under the New Deal Commerce Clause as Wickard.
I question the motives of anybody claiming to be a political conservative while defending that doctrine and that interpretation of the Constitution.
http://altlaw.org/v1/cases/383518
Look at paragraph 10, especially.
Getting the facts right, even unpalatable ones, is the essence of conservatism.