The stamp act was when the British government taxed the colonists for almost every document printed. The colonists were very angry ewith this because it went against the "No taxation without representation" principle.
"Upon the whole, I will beg leave to tell the House what is really my opinion. It is, that the Stamp Act be repealed absolutely, totally, and immediately; that the reason for the repeal should be assigned, because it was founded on an erroneous principle." -William Pitt