[Westbrook]

> The harm wreaked by Marx and Engels is incalculable.

While I share your perspective and fully concur with your remarks, the past tense of "wreak" is "wrought", not "wreaked".

...brought to you by your local grammar police.

.

[aculeus]

My view on grammar: Whom cares?

[aculeus]

"Usage note ... The past tense and past participle of wreak is wreaked, not wrought, which is an alternative past tense and past participle of work." ...American Heritage Dictionary, Third Edition, 1992 p 2060

You're welcome.