Why i can't block proxy sites?

[r0utevv3]

I am trying to block proxy sites like: https://whoer.net/webproxy , https://hide.me/es/proxy , etc … using squidguard

I have the category of  [blk_BL_redirector] as deny. But I am still capable to see those pages. Is working with other categories like porn, but not with proxy sites.  Help me!https://forum.pfsense.org/Themes/flagrantly202/images/bbc/hr.gif