[1] Following a breakthrough role as a Russian sailor in The Russians Are Coming, the Russians Are Coming (1966), Law became best known for his roles as gunfighter Bill Meceita in the spaghetti western Death Rides a Horse (1967) with Lee Van Cleef, the blind angel Pygar in the science fiction film Barbarella (1968) with Jane Fonda,[1] the title character in the action film Danger: Diabolik (1968), Manfred von Richthofen in Von Richthofen and Brown (1971), and news anchor Robin Stone in The Love Machine (1971).

[3] Upon finishing college, Law appeared in Garson Kanin's Come on Strong (1962),[4][3] and worked for three years at the Repertory Theater at the Lincoln Center,[2][5] where he acted in their productions of Marco's Millions,[6] The Changeling,[7] and Tartuffe.

[15] Throughout the early seventies, he had parts in Polvere di stelle ("Stardust"), The Golden Voyage of Sinbad, Open Season, and The Spiral Staircase.

[16] Law continued to find success in Europe, acting in Docteur Justice (1975), A Whisper in the Dark (1976),Tu dios y mi infierno ("Your God and My Hell") (1976),The Cassandra Crossing (1977), the Target of an Assassin (1977), Eyes Behind the Wall (1977), The Rider on the White Horse (1978), and The Devil's Bed (1978).

[17][18] Law continued to act, taking roles in Tin Man (1983), Night Train to Terror (1985), American Commandos (1985), Moon in Scorpio (1987), Thunder III (1987), Striker (1987), Una grande storia d'amore ("A Great Love Story") (1988), Space Mutiny (1988), Blood Delirium (1988), A Case of Honor (1989), and Cold Heat (1989).

He also appeared in Alienator (1990), Shining Blood (1992), Il giorno del porco ("Pig Day") (1993), The Mountain of the Lord (1993), Hindsight (1996), My Ghost Dog (1997), Wanted (1999), and Bad Guys (2000).

[1] His final roles included Curse of the Forty-Niner (2002) (which he also associate produced), The Three Faces of Terror (2004), and Ray of Sunshine (2006).