Classic cars march during the 39th annual Labor Day Parade in Los Angeles, the United States, Sept. 3, 2018. The parade featured marching bands, union delegations, floats and classic cars. (Xinhua/Zhao Hanrong)

Members of a marching band perform during the 39th annual Labor Day Parade in Los Angeles, the United States, Sept. 3, 2018. The parade featured marching bands, union delegations, floats and classic cars. (Xinhua/Zhao Hanrong)