Is destructive to progress, relationships, and a healthy work environment,
either openly or secretly.
The first and most devastating situation is having undetected or unhandled toxic persons in the team. These will kill every drive and potential of your business. They destroy your dreams, your best coworkers, and your company in general. They make your entrepreneurial life tough.
Not getting rid of them is like having a boa constrictor around your neck. It strangles you slowly but surely. The only solution is to get them off your team, no matter what it takes.