Conservative lawmakers and groups say most exports are made without government help and that large Fortune 500 companies are the primary beneficiaries of the bank. [...] supporters, which include the U.S. Chamber of Commerce and National Association of Manufacturers, say many small businesses get help in exporting through the bank. The Securities and Exchange Commission approved rules that will allow individuals to invest in small companies through Internet portals and brokerage firms, a process known as crowdfunding. The number of loans guaranteed by the Small Business Administration in its biggest lending program, 7(a) loans, rose by nearly a quarter in the fiscal year that ended Sept.