Diverging views of what the future Canada Post work force should look like has stalled negotiations between the Crown corporation and its union.

DARRYL DYCK/THE CANADIAN PRESS

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The labour dispute between Canada Post and the Canadian Union of Postal Workers – a conflict that has dragged on for 19 months – has effectively become a contest of wills.

The latest escalation in the dispute happened Wednesday, when CUPW filed an unfair labour practice complaint against the postal service, accusing it of intervening in negotiations by directly communicating with employees about bargaining terms in order to sway them.