The Collaborative International Dictionary of English v.0.48:

Hatchel \Hatch"el\ (-[e^]l; 277), n. [OE. hechele, hekele; akin
   to D. hekel, G. hechel, Dan. hegle, Sw. h[aum]kla, and prob.
   to E. hook. See Hook, and cf. Hackle, Heckle.]
   An instrument with long iron teeth set in a board, for
   cleansing flax or hemp from the tow, hards, or coarse part; a
   kind of large comb; -- called also hackle and heckle.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Heckle \Hec"kle\, n. & v. t.
   Same as Hackle.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Heckle \Hec"kle\, v. t.
   1. To interrogate, or ply with questions, esp. with severity
      or antagonism, as a candidate for the ministry.

            Robert bore heckling, however, with great patience
            and adroitness.                       --Mrs. Humphry
                                                  Ward.
      [Webster 1913 Suppl.]

   2. To shout questions or jibes at (a public speaker), so as
      to disconcert him or render his talk ineffective.
      [PJC]

WordNet (r) 3.0 (2006):

heckle
    n 1: a comb for separating flax fibers [syn: hatchel,
         heckle]
    v 1: comb with a heckle; "heckle hemp or flax" [syn: heckle,
         hackle, hatchel]
    2: challenge aggressively

Moby Thesaurus II by Grady Ward, 1.0:

70 Moby Thesaurus words for "heckle":
   aggravate, annoy, badger, bait, barrack, be at, bedevil, beset,
   bother, bristle, brown off, bug, bullyrag, burn up, card, chivy,
   comb, curry, devil, discomfit, discompose, disconcert, distemper,
   disturb, dog, embarrass, exasperate, exercise, fash, faze, get,
   gripe, hackle, harass, harry, hassle, hatchel, hector, hound, irk,
   irritate, jeer, miff, molest, nag, needle, nettle, nudzh, peeve,
   persecute, pester, pick on, pique, plague, pluck the beard, pother,
   provoke, rake, rattle, ride, rile, roil, ruffle, taunt, tease,
   torment, try the patience, tweak the nose, vex, worry