"Whoever, being an officer, or employee of the United States or any department or agency thereof or representing himself to be or assuming to act as such, under color or pretense of office or employment commits or attempts an act of extortion, shall be fined $5, 000 under this title or imprisoned not more than three years, or both; but if the amount so extorted or demanded does not exceed $1,000, he shall bejinefIunder..this fj!le or imprisoned not more than one year, or both. " See United States Code Title l8 Crimes and Criminal Procedure. Chapter 41. Title: Extortion and Threats. Section 872. Title: Extortion by officers or employees of the United States