Though the party is closely allied with the organized labor movement, Democratic
officials have less than fond memories of a labor dispute between Boston
officials and the local police union that complicated preparations for the
party’s 2004 convention in that city. Union officials did not drop their threat
to picket the Democratic convention site until that June, when prospective
nominee John Kerry refused to cross a police picket line to attend a Boston
meeting of the U.S. Conference of Mayors.