Monetary policy involves decreasing the money supply.

The monetary policy which is involved in reduction of supply of money is called Contractionary Monetary Policy.

Contractionary Monetary Policy is a type of monetary approach used to battle expansion which includes diminishing the cash supply so as to expand the expense of obtaining which thus diminishes GDP and hoses swelling.  

At the point when the economy is expressing pressure, the national bank (in US, the Federal Reserve) diminishes the cash supply by either increment in the rebate rate or clearance of government securities or increment in the necessary save proportion or via completing every one of the progressions at the same time.

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