WordNet (r) 3.0 (2006):

stranglehold
    n 1: complete power over a person or situation; "corporations
         have a stranglehold on the media"; "the president applied a
         chokehold to labor disputes that inconvenienced the public"
         [syn: stranglehold, chokehold, throttlehold]
    2: a wrestling hold in which the arms are pressed against the
       opponent's windpipe

Moby Thesaurus II by Grady Ward, 1.0:

83 Moby Thesaurus words for "stranglehold":
   Oregon boat, arrest, arrestation, arrestment, bear hug, bilbo,
   blockage, blocking, bond, bonds, bridle, camisole, chains, check,
   clogging, closing up, closure, collar, constriction, cramp, cuffs,
   delay, detainment, detention, fetter, fixation, foot-dragging,
   full nelson, gag, gyves, half nelson, halter, hamper, hampering,
   handcuffs, hindering, hindrance, hobbles, holdback, holdup,
   hopples, impediment, inhibition, interference, interruption, irons,
   leading strings, leash, let, lock, manacle, muzzle, negativism,
   nuisance value, obstruction, obstructionism, occlusion, opposition,
   pillory, quarter nelson, reins, repression, resistance, restraint,
   restraints, restriction, retardation, retardment, scissors,
   setback, shackle, squeeze, stocks, straightjacket,
   strait-waistcoat, straitjacket, stricture, suppression, tether,
   toehold, trammel, trammels, yoke