I have looked at other the scripts to delete feature classes in Geodatabases but all I can do is remove the feature classes from the Contents window but they are still in the Geodatabase in Catalog. I'm not sure that I am using the correct function Delete_management
arcpy.env.workspace = r"C:\Data\Temp.gdb"
fc_Delete = ["fcOut1a","fc_Out2a","fc_Out3a"]
for fc in fc_Delete: