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$dontRem  = array('adam','admin'); /* add any additional context you dont wish to have removed here */
$users = $modx->getCollection('modUser');
 
foreach($users as $user){
    $id = $user->get('id');
    $name = $user->get('username');
    if(!in_array($name,$dontRem)) { 
        $response = $modx->runProcessor('security/user/delete',array('id'=>$id));
        if ($response->isError()) {
		        echo $response->getMessage() . '<hr/>';
		    }
		    else{
		        echo "removed $id";
		    }
    }
}