员工离职需支付违约金吗？劳动合同要交还单位吗？

Group 1 - The Labor Contract Law allows employers to require employees to pay liquidated damages if they violate the service period agreement after receiving specialized training [2][5] - Employers can include confidentiality and non-compete clauses in labor contracts, with provisions for economic compensation during the non-compete period [3][5] - Apart from the specified circumstances, employers cannot impose liquidated damages on employees [4][5] Group 2 - Employees are not required to return the labor contract to the employer upon leaving the company, as both parties retain a copy [6]