Hmm, they do have some similarities.   But McCarthy was a loose canon claiming all sorts of evidence that proved to be nothing but public lies.    In similarity, both McCarthy and maybe the current Democratic party use innuendo about ties to communist Russia.  The Democratic party itself has been far more careful not to make exact claims of association, but to be setting up investigations.  It remains to see what the facts will bring out.

McCarthy was a stain on the American political process.  It remains to be seen how the Trump Administration will fare once the investigation is complete.   In the meantime there's a lot of howling from both sides.