Whoever, being a disbursing officer of the United States, or any department or agency thereof, or a person acting as such, in any manner converts to his own use, or loans with or without interest, or deposits in any place or in any manner, except as authorized by law, any public money intrusted to him; or, for any purpose not prescribed by law, withdraws from the Treasury or any authorized depositary, or transfers, or applies, any portion of the public money intrusted to him, is guilty of embezzlement of the money so converted, loaned, deposited, withdrawn, transferred, or applied, and shall be fined under this title or not more than the amount embezzled, whichever is greater, or imprisoned not more than ten years, or both; but if the amount embezzled is $1,000 or less, he shall be fined under this title or imprisoned not more than one year, or both.