Hook to run after removing a user - wordpress

Question

I have a function where I duplicate a user to all subsite when they registered.
I achieved that by doing this:
function sync_user( $user_id )
{
$list_ids = get_sites();
$current_site = get_current_site();
$info = get_userdata($user_id);
foreach( $list_ids as $list )
{
if ( $list->blog_id != $current_site->id )
{
add_user_to_blog($list->id, $info->ID, 'subscriber');
}
}
// quick fix for: above somehow doesn't add to main site. add to main site here.
add_user_to_blog(1, $info->ID, 'subscriber');
}
Now, I want to "unsyc" the user when I removed the user from the site. I tried to hook it by using 'remove_user_from_blog', but it caused infinite loop.
Where can I hook the following code so that I can remove all those users that I added previously using above code?
function unsync_user( $user_id )
{
$list_ids = get_sites();
foreach( $list_ids as $list )
{
remove_user_from_blog( $user_id, $list->ID );
}
}
edited the title for clarity

Answer 1

AbdulRahman was correct about that. When user click 'remove' from the user list, the action not fire 'delete_user' or 'deleted_user' hook. I tested it.
I think it is tricky. So, here is how to add custom removed_user action. Add these lines below into your plugin.
add_action('remove_user_from_blog', function($user_id, $blog_id) {
// checking current action
// refer: wp-admin/users.php:99
$wp_list_table = _get_list_table( 'WP_Users_List_Table' );
if( $wp_list_table->current_action() != 'doremove' ) {
return; // only proceed for specific user list action
}
$fire_removed_user_hook = null; // closure reference
$fire_removed_user_hook = function() use ($user_id, $blog_id, &$fire_removed_user_hook) {
do_action( 'removed_user', $user_id, $blog_id );
// remove the hook back
remove_action('switch_blog', $fire_removed_user_hook);
};
// restore_current_blog called at the last line in the remove_user_from_blog function
// so action switch_blog fired
add_action('switch_blog', $fire_removed_user_hook);
}, 10, 2);
add_action('removed_user', function($user_id, $blog_id) {
// the user removed from be blog at this point
}, 10, 2);

Answer 2

The hook "deleted_user" runs after a user is deleted ("delete_user" runs before the deletion occurs):
https://codex.wordpress.org/Plugin_API/Action_Reference/deleted_user