03-21-2019
With so little information given, there isn't much that we can say other than that someone who knows the appropriate password or has the appropriate privileges was logged in at the time the change was made. You say that many things started failing all of a sudden. That is the time at which it happened.
What manager is responsible for the group from which that user was removed? Did that manager ask/authorize that user to be removed from that group? Was that user transferred to a different group? Was that user fired?
Other than that user being unable to run jobs requiring the privileges of that group ID, is anyone other than that user unable to run any code that they need to run? If so, why? I.e., why are other users trying to run code as another user instead of using their own accounts? Why aren't their user IDs in the group if they need to run code that requires privileges to run code that affects projects owned by that group?
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gpasswd(1) General Commands Manual gpasswd(1)
NAME
gpasswd - change group password
SYNOPSIS
gpasswd [-r|-l|-u] [group]
DESCRIPTION
gpasswd changes passwords for group accounts. Only an administrator may change the password for any group. The used hash algorithmus is
defined by the value of GROUP_CRYPT or, if not specified, CRYPT from /etc/default/passwd. If not configured, the traditinal des algorith-
mus is used.
OPTIONS
-r Remove group password.
-l A system administrator can lock the password of the specified group.
-u A system administrator can unlock the password of the specified group, if the group is not passwordless afterwards (it will not
unlock a group that has only "!" as a password).
FILES
/etc/group - group account information /etc/default/passwd - default values for password hash
SEE ALSO
group(5), groupadd(8), groupdel(8), groupmod(8)
AUTHOR
Thorsten Kukuk <kukuk@suse.de>
pwdutils July 2006 gpasswd(1)