The NSA, the original primary developer of SELinux, released the first version to the open source development community under the GNU GPL on December 22, 2000.[6] The software was merged into the mainline Linux kernel 2.6.0-test3, released on 8 August 2003. Other significant contributors include Red Hat, Network Associates, Secure Computing Corporation, Tresys Technology, and Trusted Computer Solutions.
Same thing with SHA-1, 2, and I’m not sure about 3.
Same for the improvements they did on DES, and for open-sourcing Ghidra. Sometimes they are the good guys.