Dont want to turn this into a flame war or anything but I have overall had bad experiences with SLA members.
They often come on our TTT server in groups, sometimes with changed names, and ghost/RDM. '| SLA | Fatal1ty' and '| SLA | Nightfall' came in two days ago with a bunch of people and a few of them (Including Fatality) turned on their aimbots and went on a rampage. They did it one each round so only one of them got banned each round, so someone else could toggle on to ruin the next...We had about 6 rounds ruined by them doing this.
If SLA are aware of these people going on other TTT servers and trying to disrupt gameplay, then its pretty pathetic really.
This doesn't really need my opinion or comment, but you should make sure they're with SLA first (I've seen people who put on fake clan tags just to cause drama, it was actually pretty funny at the time). And even if they are, they don't represent SLA itself.
Although it does seem that it's starting to get a bad reputation from it's owner...