Harris-Walz.
https://www.usatoday.com/story/news/politics/elections/2024/09/23/kamala-harris-police-endorsement/75354660007/
"The group, Police Leaders for Community Safety, was created in 2024 as a non-partisan 501(c)4, and describes itself as an organization that represents dozens of police officials."
From the IRS:
"Under the Internal Revenue Code, all section 501(c)(3) organizations are absolutely prohibited from directly or indirectly participating in, or intervening in, any political campaign on behalf of (or in opposition to) any candidate for elective public office."
But they are a 501(c)(4), so slightly different...
"IRC 501(c)(4), (c)(5), and (c)(6) organizations may engage in political campaigns on behalf of or in opposition to candidates for public office provided that such intervention does not constitute the organization's primary activity."