(April 6): Even as cryptocurrencies steadily gain support on Wall Street, they’re still regarded by regulators as a tool for criminals to conceal shady transactions -- posing a challenge to the nascent industry as it seeks to win wider respect.

That’s creating a potentially lucrative opportunity for new groups in Washington advocating for digital currencies. Some prominent crypto lobbying organizations say they’ve increased their membership and raised millions of dollars to help improve the industry’s image.