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Clan Mars 50
StarCraft and BroodWar clan. Contains downloads, maps, and strategies.
http://geocities.com/clanm_50/index.html

Marine Corps
Offers an organized rank system, member's page, downloads, and rules for orderly conduct within the clan.
http://www.angelfire.com/sc2/marinecorps/main.html

The Mars Clan
A small clan. Has strategy and hints.
http://www.angelfire.com/games3/starcraftclanmars/

Mercenary Lancer Assassins
StarCraft clan with downloads and member sign up and listing.
http://mla_clan.tripod.com/Main.html

MFx Clan
Provides a member list, news, and squad information.
http://www.freewebs.com/nysikto/

Mid-West Pimps
Membership and sign-ups.
http://www.fortunecity.com/roswell/blavatsky/37/

Missing In Action
Includes forums, rules, a roster and an application form.
http://www.freewebs.com/scmia/

Mistik Knights
Members list and clan rules.
http://mistik_kraze.tripod.com/

Mutations
Contains maps and strategies.
http://www.angelfire.com/games2/mutations/

Mystical Dragons Clan
A clan focused on fun. Has cheats and joining information.
http://www.geocities.com/mystical_dragons2000/