The receipt in Mikhail Gorbachev's personal files was written in block letters.
"Received $2,000,000 (two million dollars) USA," said the 1987 slip of paper signed "Gus Hall."The leader of the Communist Party USA was hard up for money, but he had come to the right place.
The receipt was among formerly top-secret documents released this week to The Washington Post and the Russian magazine Ogonyok.
Along with the receipt was a "Dear Comrade" letter from Hall to his friends in the Kremlin.
"I don't like to raise the question of finances," it began, "but when the `wolf' is at the door, one is forced to cry out."
Hall's letter and dozens of others from left-wing leaders around the world went to Gorbachev's desk. The Politburo held a meeting and all agreed that their friends in America must be helped.
The Soviet state bank transferred the funds to the KGB for shipment to Hall, the Post said. A KGB courier made contact two months later with Hall, who wrote the receipt.