Return a 301 instead of 302

HTTP::respond will not automatically set the URL in the Location header like HTTP::redirect will. So you need to set the URL as the Location header value. Also, with switch you can use - as an action if it's the same action for multiple cases. Lastly, can you double check your * wildcards to make sure you're using it to match in the correct location. The HTTP::host value will only return www.example.com if the URL is http://www.example.com/some/path.html.

when HTTP_REQUEST {
   switch -glob [string tolower [HTTP::host]] {
      "www.*" -
      "peoples.net" -
      "peoples.com" -
      "peoples.mobi" -
      "peoplesfor.org" -
      "peoplesfor.net" -
      "peoplesfor.com" -
      "speople.net*" -
      "speople.org" -
      "speople.com" -
      "people.net" -
      "people.com" -
      "*-people.org" -
      "*-people.net" -
      "*-people.com" -
      "*-peoples.org" -
      "*-peoples.net" -
      "*-peoples.com" -
      "people.org" { HTTP::respond 301 Location "http://peoples.org[HTTP::uri]" }
   }
}

Aaron