A California man accused of sending one of Santa Clara's top public health officials dozens of threatening letters with the boogaloo insignia, has been charged with stalking and threatening.

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Alan Joseph Viarengo, 55, faces two felony counts after prosecutors said he sent 24 letters to Dr. Sara Cody between April 9 and July 29, mocking her handling of the coronavirus pandemic and telling her he posted her address online, NBC News reported.

The letters included a picture of an igloo in the place of a return address and the phrase “Let’s Boogie” written above, according to court documents.

The "boogaloo" is a far-right anti-government movement. The Anti-Defamation League defined “boogaloo” in 2019 as being “extremists’ new slang term for a coming civil war" and noted that the term has been picked up by white supremacists and others.

Police said they witnessed Viarengo drop a letter in a mailbox July 29, which they said was addressed to the doctor. He was arrested almost a month later, on Aug. 27, according to booking records.

Upon his arrest, detectives uncovered a cache of more than 100 firearms, including potential assault rifles, explosives, thousands of rounds of ammunition, tools for manufacturing ammunition, and Confederate flags, according to court records.

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He has a prior conviction for sending threatening letters to law enforcement in 1996, but the conviction was overturned later after a member of the prosecution was accused of ethical violations.