Uber, officially Uber Technologies Inc., has been the subject of controversies. Like other ridesharing companies, the company classifies its drivers as gig workers/independent contractors. This has become the subject of legal action in several jurisdictions. The company has disrupted taxicab businesses and allegedly caused an increase in traffic congestion. Ridesharing companies are regulated in many jurisdictions and the Uber platform is not available in several countries where the company is not able or willing to comply with local regulations. Other controversies involving Uber include various unethical practices such as aggressive lobbying and ignoring and evading local regulations. Many of these were revealed by a leak of documents showing controversial activity between 2013 and 2017 under the leadership of Travis Kalanick.