The Hill Valley City Council was the governing body of Hill Valley, California. It had the power to over-ride other city authorities, such as the zoning commission, by way of a unanimous vote among the city council members.
In 1971, in the alternate timeline where an elderly Biff Tannen traveled from 2015 to 1955 with a Grays Sports Almanac to make himself rich, Goldie Wilson, Stanford S. Strickland, Jenkins, and two other individuals sat on the council. Biff had the plans for a mansion drafted that year, but the zoning commission deemed that it was too large.
Biff barged into the city council meeting, and demanded a vote to get his plans approved. However, Mr. Strickland objected, and the vote had to be unanimous. Biff tried to bribe Strickland by telling him that he would build a new gym for Hill Valley High School and call it the "Gertrude Tannen Memorial Gym". However Strickland told him that he could not be bought, which led Biff to go to more drastic measures.
He sent a box of cigars to Strickland at his office at the high school, with a note that made it seem they were a gift from someone who was happy that he stood up to Tannen. When Strickland lit one, it turned out to be a novelty exploding cigar, which exploded and set light to a pile of papers on his desk. When Mr. Strickland tried to put the fire out with the fire extinguisher, the fire grew out of control as Biff's gang had replaced the extinguisher fluid with an accelerant.
Biff sent a photograph of Strickland lighting the cigar in his office, which led to an investigation. Strickland was forced to step down as principal and as a member of the city council while the investigation was in process. With Strickland out of the way, Biff's mansion plans were approved.
George McFly was given a tip by an informant that stated Biff bought off a member of the city council. However, this informant turned out to be Biff himself, who lured George into an alley in 1973 and shot him. He then had a member of the Hill Valley Police Department, which he controlled, cover it up by pinning George's murder on Red the Bum, by planting George's wallet on him. With George gone, Biff was able to convince Lorraine Baines McFly to marry him, in order to help her family, who were all in financial trouble because of Biff's dealings through BiffCo.