This is not correct. I work on H1b and have tons of friends on L1 visa. When employee is transferred from India to US, they are supposed to get salary based on US County ( that's right, its COUNTY) they will be working in. Before coming to US ( or filing visa) lawyer is supposed to file LCA ( called Labor Condition Application) which mentions prevailing wages for that particular job title. If anyone is getting paid less than what is mentioned as LCA then its blatant violation of law. You can call USCIS/ICE helpline and within 24 hrs action will be taken and most likely employer will be fined severely.
http://en.wikipedia.org/wiki/Kaveri