The BJP today lashed out at the Congress chief Rahul Gandhi over the income tax notice to his brother-in-law and asked as to why was he silent on the issue. "Fugitive tycoon Vijay Mallya and Robert Vadra, the epitome of corruption during the Congress-led UPA government, are now feeling the heat of the law. They are feeling insecure," the BJP spokesperson Sambit Patra told reporters here.