Did Nazis congregate at a Jersey City Church?

My mother told me that during WWII — since St. Nick’s in the Heights was still then an ethnically German parish — all activities outside of church services and the regular school day were cancelled. This was by direction of the government. The anxiety was that enemy sympathizers would use the church and school as a base. How eliminating piano lessons at the convent actually helped the war effort is not easy for me to see.