Sensing growing frustration among Bolshevik supporters, Lenin suggested an armed political demonstration in Petrograd to test the government's response. Amid deteriorating health, he left the city to recuperate in the Finnish village of Neivola. The Bolsheviks' armed demonstration, the July Days, took place while Lenin was away, but upon learning that demonstrators had violently clashed with government forces, he returned to Petrograd and called for calm. Responding to the violence, the government ordered the arrest of Lenin and other prominent Bolsheviks, raiding their offices, and publicly alleging that he was a German agent provocateur. Evading arrest, Lenin hid in a series of Petrograd safe houses. Fearing that he would be killed, Lenin and fellow senior Bolshevik Grigory Zinoviev escaped Petrograd in disguise, relocating to Razliv station.
Source: Wikipedia