In Gmail, "blocking" doesn't mean the email disappears into a void. Instead, Gmail automatically routes any incoming messages from that sender directly to your folder.
If your goal is to see a list of people you have blocked (to verify a block or find a specific sender), you cannot do this through the Spam folder. You must access your . how to check blocked email on gmail
Not directly possible. Use the web method above. In Gmail, "blocking" doesn't mean the email disappears