Frank Anthony Grillo (born June 8, 1965) is an American actor known for his roles in films such as Warrior (2011), The Grey (2012), End of Watch (2012) and Zero Dark Thirty (2012). He had his first leading role in the action horror film The Purge: Anarchy (2014), portraying Sergeant Leo Barnes, a role he reprised in The Purge: Election Year (2016). He also plays the Marvel supervillain Brock Rumlow / Crossbones in the Marvel Cinematic Universe. Grillo's television work includes recurring roles in the series Battery Park (2000), For the People (2002–2003), The Shield (2002–2003), Prison Break (2005–2006), Blind Justice (2005), and The Kill Point (2007). He has also starred as Hart Jessup in the soap opera Guiding Light (1996–1999), Nick Monohan in sci-fi series The Gates (2010), and since 2014, he has played Alvey Kulina in the DirecTV drama series Kingdom.