Ferguson had denied the official charge on Feb. 1, but has now been fined 12,000 pounds for the disbaraging remarks about Beck's "shockingly bad" performance following a decision by an Independent Regulatory Commission, which included written evidence by the United boss.
Speaking after the draw, which saw Tottenham net an injury-time equalizer through Clint Dempsey at the end of a sequence in which Ferguson thought United had won a throw-in, the Red Devils manager pulled up past examples of mistakes by Beck and highlighted Wayne Rooney's unsuccessful penalty appeal from earlier that game.
"I think we should have had a throw-in down our side of the pitch but that linesman never gave us a thing all day," Ferguson said after the match. "For me, it was a poor performance by him. He never saw the penalty kick for Wayne Rooney and some other decisions too.
"We remember him well from his time at the Chelsea game when Didier Drogba was three yards offside and he gave onside. I think he had a shocking game today, and I'm disappointed in his performance, I really am.
"I think he has had a bad game, and we never got anything from that side of the pitch. We got a bad break."
Follow GOAL.COM on Twitter