What is the status of those who spy on Muslims and report to the police when Muslims are performing Salaat in the Musjid?

Answer

Such rubbishes are among the worst munaafiqeen. They are not Muslims. They will rot even before their bodies will be dumped in their graves. They are more contemptible than sewer rats. Regarding these snitches and others such as the Bogus uucsa Munaafiqs, the Qur'aan Majeed says:

"Who is a greater zaalim (oppressor) than the one who prevents the Name of Allah from the Musaajid, and he strives in the ruin of the Musaajid?" (Al-Baqarah, 114)

They are indeed munaafiqs. They have betrayed Allah Ta'ala, the Rasool, the Ummah and Islam. There is no conundrum in their nifaaq and kufr.