Frank Grillo is an American actor. He has played Brock Rumlow / Crossbones in the Marvel Cinematic Universe, as well as Rick Flag Sr. in the DC Universe. His film credits include Warrior, End of Watch, Homefront, and Paradise Highway. Grillo has also starred in The Purge film franchise and produced the films Copshop and BOSS LEVEL. He appeared in the TV series Prison Break and appeared in the films Long Gone Heroes and Werewolves.