Faust P. Moreschi, 73, an official of the Laborers International Union of North America (AFL-CIO) and a member of the labor movement in this area for more than 40 years, died of leukemia Tuesday at George Washington University Hospital.He lived in Alexandria.

Mr. moreschi was born in Chicago. In 1926 he moved to Quincy, Mass., where his father, V. Moreschi, was general president of what was then known as the Hod Carriers and Building Laborers Union. In 1937, Faust Moreschi moved to Washington and founded Laborers Local No. 764, a unit of the Hod Carriers.

He held that post until 1942, when he became president of the Greater Washington, D.C., District Council of Laborers. He held that position until 1947.

In 1940 the Hod Carriers, now known as the Laborers International Union of North America (AFL-CIO), moved its national offices from Quincy to Washington. After his years at the Greater Washington Council, Mr. Moreschi went to work for the parent union.

Among his principal duties was supervision of the provisions of the Davis-Bacon Act, under which wages on all federal construction projects are determined. He continued this work until his death.

Mr. Moreschi's survivors include his wife, Edna Irving Moreschi of Alexandria; two sons, John V., of Quincy, and Henry J., of Alexandria; one brother, John J., of Wilmette, ILL., and eight grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the Leukemia Society of the Washington Metropolitan Area. c