From 1876 to 1883, the parish was served by Pastor Hyacinth (Jacek) Gulski On May 1, 1886 about 2,000 Polish workers gathered at St. Stanislaus to organize and protest the 10-hour work day.

A parade was organized from St. John’s Cathedral, where Father Kozlowski had been consecrated, to Saint Stanislaus in a carriage pulled by four horses.

Crowds gathered once again at the church a year later after Bishop Kozlowski fell ill from blood poisoning and died on August 7, 1915; 30,000 mourners attended the funeral.

The original copper sheet domes of the church were replaced with 23 carat gold leaf in 1966, and all of the stained glass windows were removed.

In May 2007, St. Stanislaus became the home of the Archdiocese of Milwaukee's Latin Mass community, offering the Extraordinary Form (the 1962 missal of John XXIII) weekly on Sundays, at 10:00 AM.

While Mass in Spanish was relocated to neighboring St. Anthony's Church, St. Stanislaus continues to offer the "missa ordinaria" (the 1970 missal of Paul VI) in English each Saturday evening, at 4:00 PM.