The Hart Foundation
The WWE was a strange place after the departure of Hulk Hogan and many other stars of the WWE's classic era. There was a huge void for major heels that would be recognizable to fans. While the WWE tried, and failed, to fill this void with everyone from King Mabel to Kurrgan the Interrogator, they struck gold with the Hart Foundation.
Bret Hart, often the World Champion during this era, was the group's leader and defender of the Hart family dynasty. He was joined by brother Owen, former tag partner Jim Neidhart--who was also his brother in law--American wrestler Brian Pillman, dubbed the loose cannon, and British Bulldog, who also married one of Hart's sisters.
Primarily the group worked as heels in North America, but when they journeyed to Canada they would be cheered as baby faces. Allegedly, Bret Hart was regretful of having to put down American wrestling fans as part of his gimmick, but even he agreed it was brilliant booking.
At one point the Hart Foundation held nearly every title in WWE, and were sort of a pre cursor to the NWO faction which would form in rival WCW.