They have now released a video which shows staff being threatened and intimated, as well as instances of anti-social behaviour on waste trucks.
In one incident, a truck is blocked by a resident's car so they can tip their black bin rubbish into a green bin truck.
Greyhound's Managing Director, John Brosnan said: "Our crews are experiencing an increase in threatening behaviour. We have a duty of care to the health and safety of our employees.
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"We have reported the incidents to Gardai and also hope for assistance from local representatives.
"However, we may be forced to consider suspending collections on some roads. We are calling on people to respect our crews while they do a difficult job."