I don't see the point. Even if there is organized bias, what can Congress legally do about it?
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Something similar to their targeted of US Univerities/Colledes for anti-semitism and for being "woke." Trump has threatened the Harvard endowment, its ability to enrol foreign students, federal research funding, among others.
As a charity they are tax exempt - that could be revoked. The US government could declare them to be a foreign influence operation and require them to register as foreign agents. They could add a requirement that everyone on Wikipedia must declare who they are before editing. They could restrict various pages from being displayed in the US. They could even block or even cease the domain if they wanted to play hardball.
Do not underestimate the levers of pressure that could be deployed here.