Chayav Misa (חייב מיתה) for having long Payos

Daf Shel Shabbos Rosh Chodesh Tamuz

Ta’anis 17 a-b

אף פרועי ראש במיתה    

     Mori V’rabi Hagaon R. Shlomo Miller Shlita, said, “  A Kohen

whose Payos are longer than a few millimeters (more than 30
days growth) would be Chayav Misa, if he enters the Bais Hamikdash*.
Payos are Sa’aros Rosh which requires to to be cut once in 30 days”.

A Kohen Gadol had to cut his hair once a week and a king every day.
Their Payos were even shorter. (if you can call it Payos)

*מן המזבח ולפנים ועבד(רמב"ם ביאת  המקדש א' הל' ח')