A.K.A. Karl Malden.
It may be that most people who know Karl Malden remember him from Streets (with a young rookie named Michael Douglas), but of course, he had an illustrious acting career outside of that well known and ground breaking TV series.
Speaking of Malden’s original Czech last name …. as Alfred Hitchcock would always appear as a walk-on in his own movies, Malden would work the name “Sekulovich” in wherever he could. From Wikipedia:
…as General Omar Bradley in Patton, as his troops slog their way through enemy fire in Sicily, Malden says “Hand me that helmet, Sekulovich” to another soldier. In Dead Ringer, as a police detective in the squad room, Malden tells another detective: “Sekulovich, gimme my hat.” In Fear Strikes Out, Malden, playing Jimmy Piersall’s father John, introduces Jimmy to a baseball scout named Sekulovich. In Birdman of Alcatraz, as a prison warden touring the cell block, Malden recites a list of inmates’ names, including Sekulovich. Malden’s father was not pleased, as he told his son ‘Mladen, no Sekulovich has ever been in prison!’ Perhaps the most notable usage of his real name was in the TV series The Streets of San Francisco. Malden’s character in the program, Mike Stone, employed a legman (played by Art Metrano) with that name, who did various errands. Also, in On the Waterfront, in which Malden plays the priest, among the names of the officers of Local 374 called out in the courtroom scene is Mladen Sekulovich, Delegate.