For sure Fox et al. have been pushing the idea that scientists have biases, but it can also be true that science has become more biased.
Update: a little evidence. This doesn't cover change over time, but it strikes me as fairly extreme, unless you are willing to go very far down the "reality has a liberal bias" road: https://github.com/hughjonesd/academic-bias
Liberal in US = center right
The administrative agencies do not merely “advise.” They make regulations with the force of law (legislative power), enforce those regulations (executive power), and adjudicate violations of the regulations (judicial power). That concentration of the three powers into a single entity is the very thing the Constitution goes to great lengths to avoid.