Spreading rumors behind someone’s back violates what section of the law?

Whoever spreads rumors behind his back, falsely reports dangerous situations, epidemic situations, police situations, or intentionally disrupts public order by other means, his behavior violates Article 25 of the "Public Security Management Punishment Law" According to the provisions of Paragraph 1, those suspected of spreading rumors shall be detained for not less than five days but not more than ten days according to law, and may also be fined not more than five hundred yuan; if the circumstances are relatively minor, they shall be detained for not more than five days or fined not more than five hundred yuan.

If the circumstances are serious and a crime is suspected, criminal responsibility shall be pursued in accordance with the law.