A Missouri man pleaded guilty Thursday to racketeering conspiracy in connection with his involvement in serious financial misconduct at an international labor organization.According to court documents, Tyler Brown, 44, of Kansas City, Mo., was employed by the Kansas City, Kan., headquarters of the International Brotherhood of Boilermakers, Iron Ship Builders, Blacksmith, Forgers and Helpers (the “Boilermakers Union”) as chief of staff of the Boilermakers Union and special assistant to the International President of the Boilermakers Union.