If Indian movies (no no not just Bollywood) had a site like tvtropes, this one would be real life example of SmilingStealthySanyasi. Though many of the modern sanyasis shun the stereotypical saffron robes (while maintaining the essential flowing beards), they are living embodiment of this trope nonetheless. Such characters were rife in Indian movies till late 90s. These guys are typically evil, ranging from simple peripheral villains, to owners of casinos with attached brothel services, to full fledged drug lords and terrorists.

As for Ramdev, though we don't know yet if he is evil of that proportion, there is no dearth of people speculating that he launders money, which is worse. They also speculate who his clients are. But, of course, these speculators don't have enough time, money and motivation to follow up and provide proof; they wait and watch, hoping to say "I told you so" one day. But since the political clout these sanysais wield is common knowledge, its anyone's guess as to when the reveal will happen. These poor sods are more likely to die of old age without ever uttering that.