What did the British government decide to do about Boston's port in Johnny Tremain?

I assume you are referring to the closing of the port of Boston by the British government in response to the Boston Tea Party.  The punishment was to completely close the port:  "Not one ship might enter, not one ship might leave,"  save for the King's own transports and warships.  This severe punishment actually played into the hands of would-be revolutionaries because it solidified resentment against the British even in those who thought that throwing the tea into the harbor had gone too far and who had been willing to come around to supporting the tea tax.