All-American Girls Professional Baseball League
The Colleens joined the strong Eastern Division in the 1948 season and were managed by former Major League player Dave Bancroft.
The team was the worst in the league, getting roughed up as a last-place expansion club with a 47–76 record, ending twenty nine and a half games out of the first place spot in the division.
The only team to do worse, the Springfield Sallies of the Western Division, ended 41–84 in last place, 35.5 games out of 1st place.
Both teams lost their franchises by the end of that season.
From 1949 through 1950, the Colleens and the Sallies became rookie development teams that played exclusively exhibition games.
Their tours included contests at Griffith Stadium and Yankee Stadium. The team dissolved entirely by 1951.
AAGPBL executive Mitch Skupien, who later managed in the league, served as the general manager for both touring teams.
The team's 1948 games were broadcast regularly on television station WBKB in Chicago.