He was in several episodes of "Car 54, Where Are You?" as Charley the drunk. I also remember seeing him in an episode of "All In The Family" playing a high school friend of Archie's who comes to town for a visit.
Larry would do his famous stand-up act on Car 54 - talking so much about booze that he would actually get drunk just talking about it. He did it on other shows as well. He also was an impressionist (as was his brother) and would coach actors in it.