WASHINGTON — Citing growing worries about high gasoline prices, Democratic leaders announced an effort April 28 to give the Federal Trade Commission increased authority to crack down on companies that engage in price gouging.

Two U.S. senators are urging the Federal Trade Commission to investigate whether Tesla Inc. uses deceptive marketing practices by labeling its driver-assistance systems “Autopilot” and “Full Self-Driving.”

7-Eleven Inc. was ordered by U.S. antitrust regulators to sell 293 gas-station retail stores acquired earlier this year as part of its $21 billion purchase of Marathon Petroleum Corp.’s Speedway business.

The Linde Group acknowledged that getting a merger with Praxair Inc. approved by U.S. antitrust authorities will require the industrial-gas giants to sell more assets than planned, potentially putting the $45 billion deal in jeopardy.

Two people accused by the Federal Trade Commission of using deceptive tactics to sell registration services to truck owners and operators are fighting back, asking a federal judge to allow a counterclaim against the agency for defamation and tortuous interference.

The Federal Trade Commission has charged two people with using a fake government affiliation to sell registration services to truck owners and operators.