The church organ at the Sixth Street Synagogue belonged to the St. Mark’s Evangelical Lutheran Church, which was associated with the General Slocum disaster of 1904.
On June 15, 1904, the General Slocum caught fire and sank in the East River of New York City. At the time of the accident she was on a chartered run carrying members of St. Mark’s Evangelical Lutheran Church (German Americans from Little Germany, Manhattan) to a church picnic. An estimated 1,021 of the 1,342 people on board died. The General Slocum disaster was the New York area’s worst disaster in terms of loss of life until the September 11, 2001 attacks. – Wikipedia