In each case, behind the camera was a pair of teenage brothers from the Chicago suburbs — Sam and Ben Luhmann. They do, however, occasionally allow reporters to document their days following and documenting the federal agents' movements. Video (00:18): Federal agent slips on ice Video (00:18): Federal agent slips on iceThe brothers moved here the day after ICE agent Jonathan Ross shot and killed Renee Good on Jan. 7, and were already on the streets when federal agents shot and killed Alex Pretti on Jan. 24. Sam Luhmann takes a video of a confirmed ICE vehicle for the database in Minneapolis on Jan. 26. Ben Luhmann said it seemed like agents wanted an excuse to tear gas the hostile crowd rather than needing to do it.