MOSCOW — After trying to silence Aleksei A. Navalny by jailing him, accusing him of money laundering and searching the homes and offices of his supporters nationwide, the Russian authorities on Wednesday took yet one more swipe at the country’s best known opposition leader.

Mr. Navalny’s organization, the Anti-Corruption Foundation, has been classified as a “foreign agent,” the Justice Ministry declared in a brief statement, a label frequently used under President Vladimir V. Putin to stigmatize groups critical of the Kremlin.

This status, first introduced in 2012 as a means to limit the activities of nongovernmental organizations by deterring foreign funding, opens the way for intrusive audits and inspections by the authorities.

The ministry said that Mr. Navalny’s group had been added to the list of “foreign agents” because it received funds totaling around $2,100 from a Florida company that sells doors, and a Spanish man.