The name of a group that is helding a rally in Thailand. They call themselves Red Shirts People and they wear red shirts.
Redshirts people support Thailand's ex prime minister, Thaksin Shinwatra.
This search keyword, "redshirts", is very popular now in twitter. Opposite groups some time call them "red buffaloes" as "buffaloes" in Thai means "stupid". This is an insult but ... it's a fact.
About 200 multicolored stand at Silom screaming 'go away' to #redshirts.