364492
Coming as it did six months after the sinking of the off Ireland , the Ancona sinking added to a growing outrage in the US over unrestricted submarine warfare , and US Secretary of State Robert Lansing despatched a sternly-worded protest to Vienna .
 Robert Lansing
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Robert Lansing