The Tamil Tigers aka (the LTTE for the Liberation Tigers of Tamil Eelam) are a radical group in Sri Lanka. They have been trying to overthrow the government there since the 1970's. They are famous for, among other things, suicide bombings. In recent years, their number of suicide bombings exceed those of the Hezbollah and Hamas ... 168 of them from 1980 to 2000.
They are quite a nefarious group responsible for a massive ATM fraud scheme last year in New York City as well as another scheme in Australia where they pretended to be a Tsunami relief organization and defrauded many people from their money who thought that they were assisting people who needed it. They deal human trafficking, credit card fraud and illegal arms dealing.