Flag used by Belarusian anarchists. It's a combination of white-red-white Belarusian flag with classic Anarchist black flag.
Compilation: <a href="//commons.wikimedia.org/wiki/User:Wojs%C5%82aw_Bro%C5%BCyna" title="User:Wojsław Brożyna">Wojsław Brożyna</a>
CC BY-SA 4.0
<ul><li><a href="//commons.wikimedia.org/wiki/File:Flag_of_Belarus_(1918,_1991%E2%80%931995).svg" title="File:Flag of Belarus (1918, 1991–1995).svg">File:Flag of Belarus (1918, 1991–1995).svg</a></li>
<li><a href="//commons.wikimedia.org/wiki/File:BlackFlag.svg" title="File:BlackFlag.svg">File:BlackFlag.svg</a></li></ul>