The Port Adelaide Football Club was one of the strongest SANFL clubs for a century, but by the 1950s they came to dominate in premierships, supporter base and influence. Through the 1980s and 1990s the club seemed to have their way even more, playing their tough style of football that some followers would argue escaped sanction too often as their brutal style won flag after flag. Supporters bragged that they would do the same in the AFL if given the chance.
The one critical decision that went against the Magpies was when they tried to go against an agreement with the SANFL and join the AFL, whereas the SANFL had long pushed for a more equitable national competition with the support of its clubs. The move forced the South Australian hand and saw court action and the formation of the Adelaide Crows.
With AFL competition in the city from 1991, the local league took a back seat, then from the 1997 season the AFL granted a second licence to the state. After various submissions and a strong public push to not reward Port Adelaide the proud club once again won out, becoming SA's second side. But what occurred was a Jekyll and Hyde split between the new Port Adelaide Power and the old Port Adelaide Magpies - or was that the new Port Adelaide Magpies and the old Port Adelaide Power, with both haemorrhaging money.
The SANFL has now controversially voted to end the split and allow the two parts of the club to unite under one banner - a move almost certainly good for Port Adelaide but arguably the death knell for other SANFL clubs.