CMHA apparently means the Community Mental Health Act of 1963, which apparently was an attempt to remove many patients from long term psychiatric hospitals, and have them taken care of in community centers.

From a little checking, looks like it didn’t provide enough funding, and kicked the responsibility to states, which largely didn’t bother to create the community centers, so it seems like it was essentially the first half of what Reagan finished, and just dumped all the crazies on the streets with no actual support.