Which family of multitasking, multiuser OS developed in the 1970s?

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This question is about an operating system family that was built to run many tasks at once for multiple users. Unix fits this idea precisely because it was developed at Bell Labs in the 1970s as a portable system designed for multitasking and multiuser use. It introduced core ideas that became standard in OS design, such as running several processes concurrently under a single kernel, enforcing user accounts and permissions, and providing a shell and a hierarchical file system that supported multiple users and shared resources.

Linux came later, beginning in 1991 as a Unix-like implementation inspired by Unix. Windows and Mac OS originated in the 1980s and 1984 respectively, and while they evolved to support multitasking, they were not the 1970s family that defined multitasking and multiuser capabilities in the same foundational way.