"on sound legal ground"
I hope you are very wrong.
'"on sound legal ground"
I hope you are very wrong.'
Not me. This is nothing new. Unchecked employee speech or expression can destroy a business or organization. There are protections in place so some wing-nut employee doesn't have the right to sink your business and ruin the lives of you and your employees with "free speech".
When the government acts as the employee, the same holds. The government cannot restrict speech but your employer can. If the government is your employer, they call the shots. Don't like it? Quit and you won't have to worry about it.