This page is continued from Federal Rules of Criminal Procedure:
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Transcript:
The complaint is a written statement of the essential facts constituting the offense charged. Except as provided in Rule 4.1, it must be made under oath before a magistrate judge or, if none is reasonably available, before a state or local judicial officer. [1]
Official Complaint Form
from UScourts.gov:
Download Form AO91
“The Criminal Complaint”
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Go to Rule 4 Federal Rules of Criminal Procedure
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References:
[1]: Federal Rules of Criminal Procedure 2017 ed., Rule 3: https://www.federalrulesofcriminalprocedure.org/title-ii/rule-3/