It is. https://books.google.com/books?id=Vj-NDQAAQBAJ&pg=PA346&dq=canary+intitle:cardinal+intitle:of+intitle:the+intitle:kremlin&hl=en&sa=X&ved=0ahUKEwjkxZHjhb

It is. https://books.google.com/books?id=Vj-NDQAAQBAJ&pg=PA346&dq=canary+intitle:cardinal+intitle:of+intitle:the+intitle:kremlin&hl=en&sa=X&ved=0ahUKEwjkxZHjhbjYAhWCY98KHepwADMQ6AEIKTAA#v=onepage&q=canary%20intitle%3Acardinal%20intitle%3Aof%20intitle%3Athe%20intitle%3Akremlin&f=false https://books.google.com/books?id=Vj-NDQAAQBAJ&pg=PA346&dq=c... Red Sparrow also has a canary trap, and they refer to it thusly. https://books.google.com/books?id=l-lnAwAAQBAJ&pg=PA428&dq=canary-trap+intitle:red+intitle:sparrow&hl=en&sa=X&ved=0ahUKEwiSiY2IhrjYAhUhleAKHa63CgUQ6AEIKTAA#v=onepage&q=canary-trap%20intitle%3Ared%20intitle%3Asparrow&f=false https://books.google.com/books?id=l-lnAwAAQBAJ&pg=PA428&dq=c...