If the wielder of a Green Power ring has enough will power, can he read minds and/or alter memories of an individual using his ring?
If yes, are there any such instances?
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According to CBR's "Green Lantern: 15 Things You Never Knew His Ring Could Do" article. in 1966's Green Lantern #57 (wrongly quoted in the article as #47) Hal Jordan erases Major Disaster's memory and puts in mental blocks to stop him from revealing The Flash and Hal's identities. Another example from a later comic, 1989's Action Comics #642 (as pointed out by @Shreedhar in the comments) shows Abin Sur dying on Earth and found by Clark Kent, however because Clark is not a human, he can not be the next lantern of Sector 2814 and his memory must be wiped.