griper

Noun

 * 1) One who gripes.
 * 2)  An oppressor or extortioner.
 * 3) * 1601 December 1, John Croke, speaking before Parliament, in Proceedings in the Commons, 1601, British History Online:
 * She did Accept of our intended Present, which (she said) manifested our Love and Loyalty; most graciously affirming, That She was never any greedy Griper, or fast Holder; and what We did present, She would not hoard up; but Our Eyes should see the Bestowing of it.