Julius G. Serot, 68, a retired assistant general counsel for the National Labor Relations Board who later became a labor arbitrator for the American Arbitration Association, died of cancer Thursday at a hospital in Fort Lauderdale, Fla.

Mr. Serot began his federal career in 1942 with the Immigration and Naturalization Service and the old Office of Price Administration.

In 1944, he joined the NLRB, where he was a supervisory attorney before being assigned to the District Court Branch in the Office of the General Counsel. He was associate chief and ten head of the branch, where he was in charge of injunction litigation for 10 years before retiring in 1973 as a special assistant to the general counsel.

Besides serving as a labor arbitrator on the national panel of the American Arbitration Association after retiring, Mr. Serot was on the roster of arbitrators of the Federal Mediation and Concillation Service and on the expedited arbitration panel for the U.S. Postal Service.

Mr. Serot was born in New York City and earned bachelor's and law degrees from St. John's University in New York. He had a private law practice in New York City before beginning his federal career in 1942.

After retiring, he and his wife, Lillian, moved to Pompano Beach, Fla.

Besides his wife, survivors include two daughters, Joelle Miniberg of Potomac, and Naomi Costello of Latrobe, Pa., and 10 grandchildren.