LA PAZ, Bolivia — President Evo Morales expelled the United States Agency for International Development from Bolivia on Wednesday, suggesting that it had conspired against his leftist government.

Mr. Morales made the announcement at the start of festivities to commemorate May 1, a holiday in Bolivia and in many other countries that celebrate workers’ movements and organized labor.

The agency, which has nine American employees here, had already sharply reduced its presence. The Obama administration had asked for $17 million for the agency’s Bolivia programs this year, a steep drop from its $89 million budget in 2007.

“Some institutions of the United States Embassy continue to conspire against this process, against the people and especially against the country,” Mr. Morales said. As a result, he said, “We have decided to expel U.S.A.I.D. from Bolivia.”