Willow Run margarine was the brand that we always carried in our natural food store, 30 years ago, for the vegan folks. I haven't read the label in ages though.
Also, when I was diagnosed with milk allergy, Country Crock brand in the crock (not in sticks) was casein free, but I don't know whether it was ever actually vegan.
Nowadays I try to stay away from trans fats. Has anyone been successful using coconut oil as shortening?