title: SPuser to find group membership
body: <p>I have a code in which I have to check if a user is a part of a certain group (lets say "GroupA").</p>
  
  <p>I have the user details stored in the Sharepoint variable SPUser. Now I need to check if this user is a part of GroupA and then take some action.</p>
  
  <p>How can I achieve this?</p>