New Hampshire: State teachers union calls for boycott of prominent Republican's businesses

The Manchester Union Leader reports:

The executive board of the state's largest teachers union has called for a boycott of the businesses owned by state Republican National Committeeman and Concord developer Steve Duprey because he has called for an end to collective bargaining for public employees and to teacher tenure.

What would the teachers unions do if Republicans, in New Hampshire, decided not to pay property taxes?