chokehold

or choke hold

[ chohk-hohld ]
/ ˈtʃoʊkˌhoʊld /

noun

a restraining hold in which one person encircles the neck of another in a viselike grip with the arm, usually approaching from behind: The suspect was put in a chokehold and was gasping for breath.
a stifling grip; stranglehold: a company that once had a chokehold over the PC market.

British Dictionary definitions for choke-hold

chokehold
/ (ˈtʃəʊkˌhəʊld) /

noun

the act of holding a person's neck across the windpipe, esp from behind using one arm
complete power or control the chokehold the mob has had on the town