The Major Indoor Soccer League...
was the first attempt to create an indoor professional soccer league in the United States. For many years it was also the most successful, with some teams averaging close to 10,000 fans a season. However, the league engaged in a costly bidding war with the North American Soccer League, which ultimately helped lead to the NASL's demise, and weakened the MISL. Later, it engaged in a fraternal bidding war with the AISA (Later the NPSL) for indoor soccer fans, which brought both of the leagues to the brink of bankruptcy. Finally, the league folded with a few of the remaining teams joining the NPSL.