Mumbai Police

Double your money in two months or less
Post dated cheques as a guarantee for the same
Claim they do it by investing in some wonder projects or plantations
Huge sums of money by being a part of the gift chain i.e. you gift a certain amount of money to two people, then find two people who will enter the chain by gifting you the sum. They in turn will get two more subscribers, and so on
As the scheme is run by a registered company, it is absolutely safe

All schemes offering high returns of double money within two months or such short spans have no legal sanction, nor they are reliable
Postdated cheques is not a guaranteed payment device, as they could bounce when you finally present them
There are no projects, especially agriculture based, which can give returns in less than a year. In fact, tree plantations take at least 10 years to mature
Gift schemes and chains are an offence under the Prize Chits and Money Circulation Schemes (Banning) Act of 1978
Even registered companies are not allowed to promote and run any such schemes