It has been a pain to unsubscribe from SgFreeCycle after numerous spams but it has not been easy to get Unsubscribe from the numerous email spams. There are a few way to get your unsubscribe:
1) Unsubscribe from the email itself:
NOTE this method will work only if you did not forward from the Yahoo Mails to your other mail account such as Gmail, which is the biggest mistake I have committed. This is probably the easiest method.
2) Unsubscribe from Yahoo Group:
Unsubscribe from https://groups.yahoo.com/neo/groups/all/list