OOC: Back-Story - How the Team Came Together
The way I see it, Colossus got involved when he heard about his housemate Naomi going missing one afternoon. As a sensible chap, he proceeded to search all the records and camera logs he could find until he found traces of a car leading to a suspicious building. Once there, he found that Naomi was a captive of the Black Lotus Triad... and the daughter of one of its leader, who had been looking for her ever since she ran away from home. Despite being rubbish in direct action, he insisted on going in anyway, only to run afoul of their Dragon Warriors, EXALT-using thugs who were the triad's primary enforcers. However, they weren't aware of the full extent of Colossus' abilities, and he managed to rescue Naomi and wreck part of their operations, as well as yoink complete records of their transactions for further reference.
Samantha would obviously be the point of contact for the records (because I think she still wants to put them away the right way instead of just putting two in the back of their heads. He could have met up with her during the investigation phase, and then contacted the group otherwise. Colossus also knows a Mafiya associate called Maksim who's on the verge of becoming a proper Vor; but for the Malakov Mafiya the rite of passage is taking and surviving a dose of Exalt, and the doses they use are not very safe...
Yes, I like the idea of superpowered crime syndicates using their own product to empower themselves and give them an edge over the competition. However, it's also made Colossus wonder about something; how did they even get their hands on Exalt in the first place? He suspects it was part of some ultra top secret government program to mass produce metahumans and they were leaked a prototype version of it to field test it, as it were.