From "Young Justice: Alpha Male (#1.13)"
[Quietly to Batman
] Sportsmaster revealed the possibility of a mole within the team. In light of last night's attack, Red Tornado would appear to be the traitor. But whether he betrayed us willingly or was preprogrammed is still...
[Conner launches himself at Kaldur
] YOU KNEW? That android and his maniac family nearly killed M'Gann!
[Flying towards them
] Conner, what are you doing?
Kaldur knew we had a traitor among us and *said nothing*!
And didn't tell us?