fagboy, ruler of the internets
STEAM_0:0:14388467
http://www.steamcommunity.com/profiles/76561197989042662
http://steamcommunity.com/id/sogra/

Justin
STEAM_0:0:13927684
http://steamcommunity.com/profiles/76561197988121096

Nestor
STEAM_0:1:13281563
http://steamcommunity.com/profiles/76561197986828855

Grunt(1)
STEAM_0:1:7292074
http://steamcommunity.com/profiles/76561197974849877

TK
STEAM_0:1:9041712
http://steamcommunity.com/profiles/76561197978349153

Baron von Blackhardt
STEAM_0:1:10051685
http://steamcommunity.com/profiles/76561197980369099

Chuck
STEAM_0:0:13088289
http://steamcommunity.com/profiles/76561197986442306
http://www.zombiepanic.org/forums/showthread.php?t=8778

Most likely also griefers:
STEAM_0:0:8498197
STEAM_0:0:545352

Exploding Bill
STEAM_0:0:12417
http://steamcommunity.com/id/Qua-Fung/
http://www.steamcommunity.com/profiles/76561197960290562

mudkipz
STEAM_0:0:17363546
http://steamcommunity.com/id/C92/
http://www.steamcommunity.com/profiles/76561197994992820

ArcEld
STEAM_0:1:14045919
http://steamcommunity.com/id/TherapyCat/
http://www.steamcommunity.com/profiles/76561197988357567

omoplat
STEAM_0:1:20557658
http://steamcommunity.com/profiles/76561198001381045
http://forum.i3d.net/455984-post1.html

Zappy
STEAM_0:1:12171629
http://www.steamcommunity.com/profiles/76561197984608987
http://steamcommunity.com/id/zappy93/

lawn mower man
STEAM_0:1:823644
http://steamcommunity.com/profiles/76561197961913017

Muahaha Lord (BRA)
STEAM_0:0:3214591
http://steamcommunity.com/profiles/76561197966694910
http://nadesgaming.com/hl/hlstats.php?mode=playerinfo&player=113163

[BOG] Servers Rock
STEAM_0:0:9845788
http://steamcommunity.com/id/dazwat/
http://www.steamcommunity.com/profiles/76561197979957304

AK-47
STEAM_0:0:611188
http://steamcommunity.com/profiles/76561197961488104

IMSID8395F751F9C23BE6BE5F73EAA78572B79F0C5CBC