Dear Piraisudan, I infer that your question relates to Labour Laws only. Broadly classified, all our present labour laws could be categorized as:
1. Establishment-related Laws such as the Factories Act, 1948, Shops and Establishments Acts, Motor Transport Workers Act, Mines Act, etc.
2. Laws relating to industrial relations such as the Trade Unions Act, 1926, the Industrial Disputes Act, 1947, etc.
3. Laws relating to service conditions such as the Industrial Employment (Standing Orders) Act, 1946, Equal Remuneration Act, 1976, etc.
4. Laws relating to wages such as the Payment of Wages Act, 1936, the Minimum Wages Act, 1948, the Payment of Bonus Act, 1965, etc.
5. Laws relating to social security such as the Employees Compensation Act, 1923, the ESI Act, 1948, the EPF Act, 1952, the Payment of Gratuity Act, 1972, etc.
The applicability of some Acts is based on the minimum number of employees like the Factories Act, Standing Orders Act, Bonus Act; some others are based on the number and gender composition of labour such as the Equal Remuneration Act, the Maternity Benefit Act, while still some others like the Contract Labour Act, 1970, are based on the number as well as the type of labour.
Since your organization comprises 5000 or more employees, almost all labour laws would be applicable depending upon its type and the composition of the labour force.