Andrija Telsa

Andrija Telsa was the brother of a friend of Anna Petrovic's prior and during the events of Operation Nightfall.

Nightfall
Andrija Tesla was assigned to a post that Jack Bauer and his team needed to cross to reach their informant, Jovan Tesla.

Anna Petrovic helped the team to get past the checkpoint by talking to Tesla herself. At around 10.32 a.m. local time, Tesla was approached by another guard on duty at that time, telling him a young lady was there to see him. By either asking him directly or distracting him, the team were able to get through the checkpoint.