Who is the worst GM is pro sports history?

[Triumph36]

Pretty sure it's Mike Milbury -

Milbury traded Todd Bertuzzi and Bryan McCabe to the Vancouver Canucks for Trevor Linden - Linden was decent, McCabe and Bertuzzi went on to be All-Star level players.

Traded Bryan Berard at 22 for Felix Potvin, an average goalie - Berard was on his way to become a solid offensive dman when he suffered a career altering fluke eye injury. Potvin was basically dumped a year or two later.

Traded Roberto Luongo AND Olli Jokinen for Oleg Kvasha and Mark Parrish - Parrish is a league average forward, Kvasha's out of the league, Jokinen and Luongo are near HOF level players

After that trade, drafted Rick Dipietro over Dany Heatley and Marian Gaborik

Traded the 2nd overall pick (Jason Spezza) AND Zdeno Chara for Alexei Yashin, then signed Yashin to a 10 year deal which was just bought out after 6 years - Spezza is now a superstar and Chara a top 10 defender in the league, Yashin now plays in Russia.

it's not even close. I can see Millen, or McHale (dunno much about what McHale did), or Milbury - but it's NOT isiah thomas.