Proposed law scheduled for a vote next week originally increased Americans’ e-mail privacy. Then law enforcement complained. Now it increases government access to e-mail and other digital files.

A Senate proposal touted as protecting Americans’ e-mail privacy has been quietly rewritten, giving government agencies more surveillance power than they possess under current law.

CNET has learned that Patrick Leahy, the influential Democratic chairman of the Senate Judiciary committee, has dramatically reshaped his legislation in response to law enforcement concerns. A vote on his bill, which now authorizes warrantless access to Americans’ e-mail, is scheduled for next week.

Leahy’s rewritten bill would allow more than 22 agencies — including the Securities and Exchange Commission and the Federal Communications Commission — to access Americans’ e-mail, Google Docs files, Facebook wall posts, and Twitter direct messages without a search warrant. It also would give the FBI and Homeland Security more authority, in some circumstances, to gain full access to Internet accounts without notifying either the owner or a judge.

It’s an abrupt departure from Leahy’s earlier approach, which required police to obtain a search warrant backed by probable cause before they could read the contents of e-mail or other communications. The Vermont Democrat boasted last year that his bill “provides enhanced privacy protections for American consumers by… requiring that the government obtain a search warrant.”

Leahy had planned a vote on an earlier version of his bill, designed to update a pair of 1980s-vintage surveillance laws, in late September. But after law enforcement groups including the National District Attorneys’ Association and the National Sheriffs’ Association organizations objected to the legislation and asked him to “reconsider acting” on it, Leahy pushed back the vote and reworked the bill as a package of amendments to be offered next Thursday.

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