No one wants to be a bad boss and no employer would sack an employee unless he/she can justify his/her decision.
since you have labour courts in almost all countries to support the weak minority; i.e. employees against being harassed by the employers.
However, sometimes even if you are the best boss ever and treat your employees the best you can, there may be instances where you are left with no option but to fire a certain person for the betterment of the establishment as well as the other employees and, in most instances, the person who gets fired does not look at the situation with empathy. He/she would hold a grudge against you and the company for sacking him/her rather than try to address the issues that led to this ultimate outcome.
Therefore, as an employer or a manager it is important to know how you can protect the business from disgruntled former employees who obviously did not leave employment in good standing.
Reclaim company belongings and access passes
Make sure the person hands over all the access passes and other company assets that were with him/her before he/she leaves the premises. It may be considered going a step too far but you may consider having a security personal check that he/she is not taking anything that does not belong to him/her with the mind of causing harm in the future. If this was the normal procedure no one will think bad of it but if it is not, do not implement it only for one or a few people as they will take it personally as intended and the grudge will be stronger.
Look into physical security measures
The person you fired may have carried the keys to the establishment or even to the safes depending on the job role. Therefore, as a first step, contact a commercial locksmith Brookvale and get the locks replaced or rekeyed. Most of the time a disgruntled employee would not consider entering the establishment and causing harm but you never know with all the shooting that is going around in the world.
Block access and change passwords
Similar to the physical security measures, digital security measures should also be taken as soon as possible. You need to change the passwords and block any biometric access granted to the person who was dismissed. Make sure that you block access not only to the premises but also to all the computerized systems whether standalone or web based.You know that remedying an intrusion to a computerized system is so much harder than hiring an awesome emergency locksmith to deal with the locking mechanisms that were attacked by a physical intruder.
It is not nice to spread bad things about people but if a person was fired as he/she was in the fault and was harming the company, it is best to let the others know. This will eliminate the chances of other staff members taking sides with the one that was fired and helping him/her to sabotage the business processes either intentionally or unintentionally.
Address bad rumour issues
If the disgruntled employee spreads bad things about your company either on social media or by word of mouth, address it as soon as possible. Silence will not be the best remedy in such an instance.
Most say that the best solution is to hire the right people but, no matter how good you are in judging people you will not always be right and you should always be ready to face the worst-case scenario.