Green Bay Mayor to Roger Goodell -- You're Crushing the Packers' Shot at a Super Bowl

Green Bay Mayor James Schmitt fired off an angry letter to NFL Commissioner Roger Goodell -- as promised -- claiming the labor dispute with referees is threatening the Packers on-field success ... AND putting the entire Wisconsin town in financial jeopardy.

TMZ obtained a copy of the letter ... in which the Mayor claims the NFL's elite status is being "threatened by less than qualified officials who are not quite at the same level as the rest of the league's representatives."

Mayor Schmitt, who's also a shareholder of the publicly owned Green Bay Packers, continues ... "last night's game creates a negative perception on the NFL brand, which in turn jeopardizes the Packers' chance for success as well as the potential to negatively affect our local economy."