Some background, courtesy of Wikipedia:

The horse-collar tackle is an American football maneuver in which a defender tackles another player by grabbing the back-inside of an opponent’s shoulder pads from behind and yanking the player down. The technique is most closely associated with Dallas Cowboys safety Roy Williams. This kind of tackle was banned from the NFL during the 2005 offseason; the rule forbidding it is often referred to in the press as “The Roy Williams Rule.” The rule was expanded to include the back of the jersey collar in 2006.

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