Subject: Urgent Complaint Regarding Co-Worker's Unprofessional Conduct [Your Name] [Your Address] [City, State, ZIP Code] [Email Address] [Phone Number] [Date] [Recipient's Name] [Recipient's Designation] [Company/Organization Name] [Company/Organization Address] [City, State, ZIP Code] Dear [Recipient's Name], I hope this letter finds you well. I am writing to bring to your attention a matter of serious concern regarding the behavior and conduct of one of my co-workers, [Co-Worker's Name]. As an employee of [Company/Organization Name], I believe it is crucial to address this issue promptly to maintain a healthy work environment. Firstly, I want to emphasize that I have made multiple attempts to resolve the issues I am about to address by discussing them directly with [Co-Worker's Name]. Unfortunately, our conversations have not led to any positive changes. Hence, I believe it is necessary to escalate the issue to management for appropriate intervention. The specific incidents of concern involving [Co-Worker's Name] include: 1. Insubordination: [Co-Worker's Name] frequently disregards the established chain of command and challenges authority, creating a hostile atmosphere within the team. This behavior undermines effective collaboration and compromises the overall productivity of the department. 2. Verbal Abuse: On numerous occasions, I have been subjected to demeaning and derogatory comments from [Co-Worker's Name]. This verbal abuse not only affects my emotional well-being but also disrupts the harmony within the workplace, causing considerable distress for me and potentially other colleagues. 3. Unprofessional Conduct: [Co-Worker's Name] consistently engages in unprofessional conduct, such as arriving late to work, taking excessively long breaks, and neglecting their assigned responsibilities. This misconduct reflects negatively on the company's image and sets a poor example for other employees. 4. Lack of Teamwork: Instead of fostering a collaborative environment, [Co-Worker's Name] frequently exhibits a dismissive attitude towards team projects. Their lack of cooperation and unwillingness to contribute actively hampers our collective efforts and inhibits the achievement of shared goals. I kindly request that a thorough investigation be conducted promptly to address these concerns. I trust that [Company/Organization Name] values its employees' well-being and maintains a commitment to upholding a respectful and productive work environment. Furthermore, I would appreciate being kept informed about the progress of this complaint. As a concerned employee, I am willing to assist in any further investigation or provide additional evidence if necessary. I hope that decisive measures will be taken to address this situation so that I can continue to contribute effectively to the team's success. Thank you for your attention to this matter. I eagerly await your response and a resolution to this issue. Sincerely, [Your Name]