Do i have the elements for a legal case based on the information provided in the additional details?

On Monday of this week, September 17th, I and three other employees at a local hardware store were involuntary discharged. I had been working at this store for over five years and have noticed what I believe to be multiple instances of illegal and or hazardous activity. These instances involve and are not limited to sales tax evasion involving use of an employee, a multitude of safety violations which put employees and customers in imminent danger, payroll rounding issues, denial of overtime pay, fraudulent time clock vs. hours paid discrepancies, improper disposal of toxic waste and improper storage of dangerous combustible chemicals and highly toxic waste within the work area. I was previously fearful to commit any acts of whistleblowing against these violations due to the possibility of discharge. Until now I was unaware of policy's protecting employees who report suspected violations. While I was employed most of these alleged instances were brought to the attention of my boss.