Finding a Spider Robinson story

[jdesmond]

Salutations, gentlefolk ! Might I make a request for some information ? A few years back, I read a short story. I _think_ it was by Spider Robinson, but I Could Be Wrong. Protagonist was man who'd inherited fortune, wanted to help the poor, started an _absolutely honest_ auto repair shop and used car lot. Antagonist, angry at the death of his brother in a hunger strike protesting Vietnam, was out to kill him. OK, who amongst you knows: the story's author and title ? where to find it, originally printed in ? if it's still in print or somewhere on the Web ? if we draw a blank, other good places to post these queries ? Thanks, very much, for any help you can give me with this. Yours, John Desmond