This is just a guess, but it may be for the Croatian Fraternal Union. They were founded in Pittsburgh in 1894 and, as part of their activities, hold national bowling tournaments. In an excerpt from their website it states
"The CFU has been among one of the first ethnic fraternals to launch an active sports promotional program among its youth. These sports promotions go back to the late 1920's and have continued on through the present time. The CFU Sports program is under the direction of Michael Krizmanich and includes skiing, basketball, golf, softball, soccer and, the "granddaddy" of our Society's sports program, bowling."
Currently they list over 40 lodges in Pennsylvania alone.
http://www.croatianfraternalunion.org/