National Confederation of Trade Unions (Zenroren) -- a group with close ties to the Japanese Communist Party -- attacked the reform plans of Prime Minister Junichiro Koizumi at a May Day rally held Tuesday in Tokyo's Yoyogi Park.

In a speech at the rally, attended by 80,000 union members, Zenroren President Yoji Kobayashi slammed the administration of Koizumi, who was elected to the post Thursday.

Kobayashi said the reform plan proposed by the new administration will result in increased unemployment and bankruptcies.